Monday, June 13, 2016
Another Mass Shooting.
Sunday, May 24, 2015
Nimble fingers on the metro
Thursday, February 16, 2012
Sunday, November 6, 2011
Carl Sagan - A few links worth perusing
The first five awe-inspiring minutes of Carl Sagan's award-winning Cosmos series.
Carl Sagan reading the now-legendary Pale Blue Dot passage from the book of the same name.
Carl Sagan on the Tonight Show hosted by John Denver, standing in for Johnny Carson; classic Carl Sagan.
The Demon Haunted World: The classic work on critical and skeptical thinking. It's a lifechanger.
Carl Sagan interviewed by Ted Turner circa 1989. This is part 1 of a 5 part series on YouTube, Carl Sagan at his best in describing our common humanity, space, the benefits of scientific literacy and the fragility of our world. Classic Sagan - time very well spent.
Carl Sagan's Baloney Detection Kit: The classic tool for critical thinking and detecting fallacious and/or fraudulent arguments, and a lot of other resources.
Wednesday, October 19, 2011
Fix for iTunes Store hanging at "Accessing iTunes Store"
Just found this, hope it helps someone :)
FYI: I'm running iTunes 10.5 on Windows 7 (64 bit), but apparently this works on Mac OS too......it may be due to upgrading o 10.5 last week, but I'm not certain that's what caused it. Anyway, on to the fix!
Symptom:
when you do anything in iTunes Store, itunes seems to hang showing "Accessing iTunes Store" in the banner.
Fix:
- Open iTunes - go to the top bar, click the 'Store' drop down menu
- Then click 'De-authorise this Computer'
- Enter your password
- Close & relaunch iTunes
- Click 'Store' again then click 'Re-authorise this Computer
- Enter password
et voila, the store should work properly again!
Source:
Sunday, June 26, 2011
Afterburners, Giant Airliners And......Sunburn: A Day At The Paris Airshow
It's been six years since I last went to the Paris Airshow, so when France24 announced on Twitter that they were giving tickets in exchange for tweets, I was in like flynn. And so it was on a sunny Friday morning I find myself on the RER B heading out to Le Bourget. Not too crowded, but still there was a 45 minute wait for the free shuttle to the airport.....I remembered it as not being too far a walk and arrived at the entrance in about 20 minutes. After checking in on Foursquare (of course) I pull out my camera and away we go. First stop: Ariane 5, dominating the Le Bourget skyline. I took a couple of snaps of the engines for old times sake (I have tons from previous visits, but why not?). Then off to see the Americans. A little light this year - no Navy or Army aircraft, but the Air force F15E, F16, C130, C5, C17 and Marine Corps AH1Z and UH1Y still made for nice viewing. I had an interesting talk with a Marine Corps mechanic who told me that the AH1Z is brand new; declared combat-ready only in September 2010 and hasn't yet been on the ground. Interestingly, both the AH1Z and UH1Y share 84% of the same components making maintenance a lot easier. The mechanic also said (in true jarhead style) that the Army's AH-64 Apaches have a big problem with launching Sidewinders but, ahem, the Marine Corps AH1Z has no such issues.....Semper Fi :)
I dropped in to the ESA exhibit before the flight demos and saw a presentation on the joint ESA-NASA Cassini-Huygens mission (incidentally, it's still ongoing, click here for more info). The speaker paraphrased Carl Sagan's Pale Blue Dot when talking about this photo of Earth through the rings of Saturn ; The video on the Huygens probe landing on Titan was wonderful.
And after spending what seemed like an hour trying to get a sandwich at the Paul stand (more like 15 minutes, but still) it's flight time!!
I can't hep but let slip a big goofy grin when I hear screaming jet engines and see full afterburners flaming......yep: military high performance jets. In the air today was the Dassult Rafale, the Eurofighter Typhoon and the Lockheed Martin F16. Even after seeing lots of this, I'm still blown away when I see 30-40 tonnes of metal flitting around the sky like a bat.....awesome.
The French Air Force display team, La Patrouille de France, put on a beautiful display, as alway.
There was an interesting demo by a Russian Altair amphibious aircraft configured as a firefighter - pretty cool to see it dumping twelve tonnes of water in two seconds!
And then there's the A380 - the biggest commercial airliner in service today. I saw its first public display flight here 6 years ago and it's still a wonder to watch in the air....just goes to show that airliners can put up with a LOT more than their daily grind. It's simply amazing to see it float around like a bubble in the small airspace available above Le Bourget for displays, a testament to both the engineering skills required to build it and the skills of the display pilots.
All in all: I took a truckload of photos (some of which can be viewed here), got a dose of howling jet engines and a little sunburned - a great day :)
Friday, June 3, 2011
Why I'm Not Concerned About Cell Phone Radiation
Cancers happen when an otherwise healthy cell is reprogrammed by a genetic mutation to behave as a cancerous cell. This mutation can occur either by chemical interaction or by EM radiation. The effecting agent is described as a mutagenic agent. EM radiation does this by dislodging electrons in a chromosome which ionise the molecule, allowing it to accept other atoms or molecules which in turn induce a mutation in the chromosome, sometimes leading to cancer. In this case, the effecting agent is described as a carcinogenic agent. (Note: These mutation mechanisms have been around since life first arose on Earth and are fundamental to evolution; they are NOT a result of our technology running amok.)
The IARC claim is that there is a link between cellphone radiation and two types of brain cancer. For this to happen, cellphone radiation would need to be able to ionise the DNA molecule in order to introduce a mutation. This requires a certain amount of energy that cellphone radiation simply doesn't carry. It is non-ionising radiation. To understand more about this, let's take a look at what we mean when we talk about electromagnetic radiation. Below is the electromagnetic spectrum, the range of electromagnetic radiation from longwave radio through visible light all the way up to gamma rays, increasing in energy from right to left. As the frequency of the light increases, the energy it carries also increases.
How do we know this? (Bear with me here, we'll get to cellphones shortly!) Albert Einstein won a Nobel Prize for discovering the Photoelectric Effect which, essentially, says that light above a certain frequency falling on a metal induces a current. This happens because the energy in the light's photons is sufficient to cause electrons in the metal to move. He showed that red light won't induce a current, but blue light will. Max Planck later found a relationship between the frequency of light and the energy of its photons. As we can see above, red light has a frequency of 700nm (7*10^ -7m), blue light 400nm (4*10^ -7m). It's clear from Planck's discovery that blue light is more energetic than red.
Now, back to cellphones. Where does this radiation figure on the spectrum? Look at where red light is on the spectrum. Go below it, you find Infra-red, then below it again you find the microwave region, a range of wavelengths from as long as one meter to as short as one millimeter, or equivalently, with frequencies between 300 MHz (0.3 GHz) and 300 GHz. Cellphones typically operate in the low end of the microwave region, overlapping with the high end of UHF radio frequencies, usually below 2Ghz. Obviously, this is well below the level of ionising radiation, which is beyond the UV region of the spectrum, in x-ray and gamma-ray territory. It can't be carcinogenic.
Friday, April 15, 2011
Fukushima Vs Chernobyl - A Fair Comparison? Some Resources To Learn More
There's been a lot of fearmongering about the Fukushima incident, comparing it to (or its being "worse" than) the Chernobyl incident. Make no mistake, it is a very serious situation, and warrants careful attention. But with words like catastrophe, radiation & radioactivity being bandied about with reckless abandon, there's a lot of unnecessary anxiety out there. These words have a lot of emotional baggage attached to them, and tend to cause irrational overreaction.Time for some reason. For starters, look at this:
Sources and distribution of average radiation exposure to the world population
(Source: WHO: http://www.who.int/ionizing_radiation/env/en/)
That's a lot of natural radiation! What is radiation though? And how does it relate to radioactivity? Further below are some resources I found useful in trying to get a grip on all this. In a nutshell:
- radiation is and always has been around us;
- the danger is all about the dose received over time;
- comparisons to Chernobyl are not helpful, and even that event, the worst nuclear accident in history, doesn't appear to have had the health impact we have been led to believe it had;
The links below are a good starting point to help you learn about the differences between the Chernobyl and Fukushima incidents; hopefully you'll also find out what the following mean:
- Radiation, the different kinds and their effects on health;
- Radioactivity, how it's measured and what is meant by "half-life".
- Radiation dose
These concepts aren't beyond anyone of average intelligence. You don't need a physics degree to get an understanding of the basics (I certainly don't have one!) but once you have a grasp of these ideas, the situation seems less frightening. And that can only be a good thing.
Links:
http://iaea.org/newscenter/news/tsunamiupdate01.html - IAEA's daily updates on the Fukushima situation:
http://resources.nei.org/documents/japan/FactSheet_Chernobyl_Fukushima_4-12-11.pdf - Comparison of Chernobyl and Fukushima incidents
http://mitnse.com/2011/04/12/new-provisional-ines-rating-a-chernobyl-primer/ - Overview of the Chernobyl incident.
http://www.who.int/mediacentre/factsheets/fs303/en/index.html - WHO followup of Chernobyl health impact
https://xkcd.com/radiation/ - a very useful diagram charting relative doses from almost none (bananas!) to fatal, short term massive doses.
http://www.mitnse.com - MIT's Nuclear Science Engineering website, chock full of useful information on nuclear physics and technology.
http://mitnse.com/2011/03/16/radiation-introduction-and-radiation-status-for-fukushima -What is radiation? A good introduction.
http://www.who.int/ionizing_radiation/en/ - WHO on ionizing radiation
http://www.who.int/ionizing_radiation/env/en/ - WHO on natural and manmade radiation
Various articles:
http://www.lvrj.com/health/experts-nuclear-fears-overblown-119678799.html?ref=799
http://topicfire.com/share/Fukushima-Chernobyl-Rating-But-Not-Chernobyl-Bad-17236188.html
http://www.ans.org/pi/resources/myths/
Friday, January 7, 2011
A Thought Experiment - The Case For A Cheap, Dumb-Terminal Google Tablet
Gmail. Google Calendar. Google Documents. Google Chrome. In terms of functionality, do these sound familiar? These are the basic requirements for most modern office (home or otherwise) workers: email, calendar, word processor\spreadsheet\slideshow apps, and internet browser. What's missing? An operating system.
Of course in these days of cloud computing, an OS on a local hard disk is somewhat passé. So right now we we have our Google Accounts to keep all of the above in one place. But it's a little cumbersome. You still need a local computer with its own OS. Or do you?
Imagine a dumb terminal, a Google netbook or a future, Google tablet if you will, that connects securely to a virtual Google desktop environment. All you need is a boot process that runs a citrix-type client from a small flash drive. Kick it up, log into your Google account and you're online, in a virtual Google environment. You surf the internet using Chrome and instead of your office suite of applications you have Gmail, Google Documents, Google Calendar. You don't need to backup your device: if it gets stolen, lost or otherwise destroyed, your data is still safe online. On the downside, you need a reliable internet connection, and you don't have much control over the local device, but that hasn't stopped the iPad from selling. Maybe allow for an offline mode in more expensive models?
These could be cheap, $100 laptop-type devices that we've heard about, or they could be flashy status symbol devices like the ipad. I think trying to compete with the iPad would be a foolish move even for Google, so I'll go with the low end, low maintenance device.
Anyway, just a few thoughts on what I think Google might do in the next year to 18 months. Let's see what happens.
Response to Another Astrologer
I must start out talking about astrology to a skeptic. Astrology is a branch of Metaphysics explained here http://en.wikipedia.org/wiki/Metaphysics Similar to but different to philosophy and psychology. It has been in existence over 5000 years. Astrology became more refined when Ptolemy AD 90-168 came along. Ptolemy was a Psychologist, Geographer, Mathmetician, Astronomer and finally Astrologer. He was educated in Babylon which is now Iraq/Iran where all the best educated astrologers were along with astronomers.
To summarize his approach to what is now modern day western astrology: Inspiration and insight came to him during his numerous observations as astronomer, pscyhologist,geographer&mathmetician. He correlated cycles of planets & moon to emotional and external events happening to individuals including himself he had observed on a daily basis. He was numbers oriented which lead him to the refining of the everday "transits" (predictions). He took the person's natal chart which described specific personality traits and saw how transits would affect that individual. That's called the Law of Precedence. Basically a person's nature and what they have usually done before is the basis of the Law of Precedence. So personality is based solely on date of birth? And never changes? What about mental illness or brain injury? Or simply life experience? What about twins? We all know twins that have completely different personalities, life experiences and levels of success in life. Indeed there are twins where one dies at an early age and the other goes on to a ripe old age.
I've been busy writing alot in the last few days, so haven't kept up with your dialogue with the other astrologers, but I thought I'd give you a to the point explanation of astrology and including your chart to finish it up.
Sunday, January 2, 2011
Astrology Discussion on Twitter
...and not understanding hydrogen fusion never stop the Sun from shining.
the bar pf "proof" as high as you want it to be. -it should be high. The more extraordinary the claim, the more extraordinary the proof required. If we accept astrology as valid, it means that the fundamental laws of nature as we understand them today are completely wrong. These laws have been challenged again and again, and any predictions made using them have been verified and replicated the world over.
"The Forer Effect" or "The Barnum Effect" or the "well, that's not how planets work" argument. - these are well documented phenomena. When you say you're "right" - based on what kind of prediction? Specific like "you'll slip on the stairs at work at 2.30pm on March 23rd, but it'll be only a mild sprain) Or vague like "there'll be big changes in 2011" , ie Barnum-type cold-readings? Who decides you're right, you or the client? Under what conditions?
We've stopped throwing virgins into volcanoes, yet the "superstition" of astrology persists.
Now that just couldn't be because maybe astrology works or something. Noooooo. :) -correct :)
Every argument I've heard against astrology can be applied to any branch of psychology. -Confusing pop psychology with clinical psychology and psychotherapy. Work by Skinner, Pavlov, and Milgram are among the best known examples of predictive, peer reviewed studies that stand up to the test of time. Psychotherapy doesn't have a lot of fans in the hard sciences as there are problems regarding falsifiability.
...they just saved lives. Is that "scientific"? Well, they observed results...
...and (surprise!) found they were repeatable. No lab involved, but still "scientific." -not sure about the facts of cowdung, but the process is sound. Hypothesis, experiment, replicate. Science is not a body of knowledge, it's a process. The knowledge changes, and in fact does when new evidence contradicts previous observation. The process is to get past the human factor. Ego, error, sloppiness, and fraud can all slip in. Peer review is designed to catch this. It's not perfect (nothing involving humans is!), but in the long run it works. The fact that I'm typing this on a computer that could've run the entire Apollo Program is testament to that, as is the Apollo Program itself.
So where are all the correct predictions made by String Theory"? Anyone...? Anyone...? -String theory is controversial even in the scientific community. It makes plausible claims but at this moment in time, they are untestable experimentally. Because of this, some physicists claim it's more like philosophy than science. I have no opinion; it's completely over my head, although I did enjoy the Elegant Universe! In the meantime, in mainstream science, astronomers have discovered planets outside our solar system (any incidence for astrology, by the way?) we've rendezvous'd with comets (how do they figure into horoscopes?), the Cassini mission has spent years studying the Saturn system, New Horizons will get to Pluto in a few years, and Messenger will get to Mercurian orbit in March of this year. In the 20th century we discovered that we live in a galaxy, one of billions, in a universe far bigger and older than any of our ancient ancestors could possibly have fathomed. We discovered that the anomalies in Mercury's orbit (precession of perihelion) was due to relativistic effects and can be explained by General Relativity. What advances has astrology made in the last century? Where are the predictions made by Astrology?
Sadly, most of the skeptics I hear seem to use the "scientific worldview" as the club
Make Science their Dogma, and (paradoxically) become as benighted as those they like
to feel superior to. No surprise, really: skeptics are humans too. Humans do that.
Friday, December 31, 2010
2010 in retrospect
2010 is gone. Another year over, a new one just begun (who said that again? :-P )Well, tomorrow :)
What happened this past year? Here are just a few things that stood out to me:
Tech\Internet
The iPad underwhelmed us.....but still went on to sell like hotcakes.
Google Buzz became a fizzle, leaving the way open for Facebook and Twitter. Twitter took off and is soaring. Facebook's Like button is everywhere now. Oauth is everywhere, and you can now sign on to a multitude of services with it, linking them to Facebook and Twitter with just a couple of clicks.
Wikileaks blew the whistle on a helicopter gunship crew taking out what appear to be unarmed civilians in Iraq. Assange is accused of rape. That quietens down until wikileaks unveil a huge amount of diplomatic cables between Washington and its embassies around the world. The rape accusations come screaming back. Not saying there's any connection, but it sure is strange timing. I don't know what to make of it all.....
International:
Ireland's economy implodes, bank debt is transferred to the taxpayer, and Ireland is now owned, more or less, by the EU and the IMF. Unemployment is through the roof. But Brian Cowen doesn't accept that it's his fault.
Korea heats up: First a South Korean naval ship explodes mysteriously last March. Artillery exchanges in December with more and more belligerent language from both sides. Scary times.
Times Square attempted bombing: luckily the would-be bomber didn't know what he was doing.
Eyjafjallajökull gently reminded us that we're just tenants here on earth, and that nature can shake us off like fleas at any time.
Roman Polanski was arrested in Switzerland and threatened with extradition: the "intellectual" artsy crowd throw a collective hissy fit. Sorry, if you admit to committing this kind of crime, you do the time. It doesn't matter if you cure cancer, bring world peace, end poverty, make great movies, and save the earth from a giant comet all at once: justice is blind, and Roman the movie maker should be treated in exactly the same way as, for example, Mick the bricklayer. And if Mick were on the lam, he wouldn't even have had time to get off the plane before being sent back.
Catholic Church child abuse scandal explodes, Pope is sorry :/ He visits Britain in September, and Godwins himself within minutes of opening his mouth.
Simon Singh off the hook in Chiropractor Libel case and the BCA are on the back foot but English Libel reform has not yet been implemented.
Space exploration:
A new spaceflight strategy was announced by the Obama administration to mixed reviews. Return to the moon is out, asteroid mission & Mars orbit in 20 years, with humans on the ground in about 30. Constellation is cancelled, no US heavy lift capability before 2015, meaning NASA will rely on Russian goodwill to get its astronauts into space in the interim.
The WISE mission released its first images back in February:
There was a lunar eclipse during the Winter Solstice, a rare event that won't happen again until 2094. The last such occurence was almost 400 years ago.
The Martian lander Phoenix was finally declared dead in May. The Odyssey orbiter had been listening for communication from the lander for months to no avail, so the decision was taken to officially end the mission.
SDO First light images released in April.
Messenger images of Mercury released. Messenger timeline: http://www.nasa.gov/mission_pages/messenger/timeline/index.html
Cassini continues to enthrall us, in a mission that launched in 1997. Details here: http://saturn.jpl.nasa.gov/index.cfm and here: http://saturn.jpl.nasa.gov/multimedia/products/pdfs/cassini_msn_overview.pdf
LHC goes online and Twitter is briefly taken over by Science. Science was cool for a while there...a joy to behold!
STS-131 & 132 missions added further ISS components.
STS-133 Discovery kept us waiting for a week, and then decided that she didn't want to make her last flight just yet....launch on hold, tentatively scheduled for February 3 at the time of writing, but who knows! Having said that, the tweetup was incredible! I wasn't there, but followed it via twitter and justinTV\hatcam....what a blast!
Sport
Spain won the FIFA World Cup tournament, beating The Netherlands 1-0 in the final. In the meantime, the French team collapsed into a fiasco of infighting, backstabbing, and general unpleasantness that appears to be unprecedented. It was like watching a bunch of spoiled children throwing a tantrum, and management wasn't any better.
The French rugby team however, fared better. They won the 6 Nations Rugby Tournament, Ireland second. Still showing good form, they'll be a formidable presence in next year's rugby world cup in New Zealand.
The feelgood story of the year: 33 Chilean miners were rescued safe and sound after being trapped underground for 69 days following an explosion. An estimated 1 billion people watched the rescue operation live.
Notable deaths this year:
Alexander Haig, US Secretary of State under Reagan; Viktor Chernomyrdin, Russian prime minister under Boris Yeltsin; US diplomat Richard Holbrooke; Former Hussein regime official Ali "Chemical Ali" Hassan al-Majid; mathematician Benoit Mandelbrot; neutron bomb inventor Samuel Cohen; Legendary Apollo Program launchpad boss Guenter Wendt; author J. D. Salinger; singer and civil rights activist Lena Horne; Sex Pistols manager Malcolm McLaren; Popular British comedian Norman Wisdom; Double Tour de France winner Laurent Fignon; Irvin Kershner movie director (The Empire Strikes Back); director Blake Edwards, (Pink Panther, Breakfast at Tiffany's); actors Corey Haim (The Lost Boys), Tony Curtis (Some Like It Hot), Dennis Hopper (too many to list), Gary Coleman (Different Strokes), Peter Graves (mission impossible), Simon McCorkindale (Manimal);
And on that note.....
Happy New Year!!!
Wednesday, December 29, 2010
A Bit of Fun Speculation: Why A Zombie Uprising Wouldn't Be An Apocalypse
Yep. I’ve been watching AMC’s The Walking Dead. Creeps you out at all the right places, and makes you think when you’re not jumping. I like it.
But honestly: a zombie apocalypse?
Biological improbabilities aside*, it's simply not plausible to me. But it is interesting to think that we’re so screwed up as humans that we couldn’t handle a zombie uprising. Sure there are lots of them, but they are dumb (in most incarnations - for now we'll stick with the Romero-type zombie). They don't plan, hide, adapt, co-operate or even use tools. The only weapon they have is numbers. And they’re mortal. On the other hand, you can't get them to surrender or break their morale. But still, any sizeable number of humans with weapons, armoured vehicles, construction equipment and basic engineering skills should have no problem. People would die, certainly, but I don’t think civilisation would crumble if action were taken quickly**
- The thought that our civilization is so fragile that an enemy the Romans could have defeated could bring it down;
- That human egos and emotions could overcome our intellect and allow sheer brute force destroy us;
- The sheer terror of relentless, mindless ghouls coming to devour us and our families alive;