Archives
[podcast]http://edwardwillett.com/wp-content/upLoads//2010/06/A-Better-Way-to-Keep-Cool.mp3[/podcast]
We all have our preferred temperature. Me, I like it cool. My poor college roommate can attest to that, since I just about froze him out of our room, aided by the fact I was tall enough to easily reach the air conditioning controls and he wasn’t. But hey, that was in Arkansas, and in Arkansas in late summer, I needed all the air-conditioning I could get.
Humans, despite having originated in hot parts of the world, have long looked for ways to make buildings more comfortable in hot weather. The first attempts in the 19th century involved circulating air over blocks of ice, but modern air conditioning first had to await the invention of mechanical refrigeration.
Liquids absorb heat from their ...
Posted by Edward Willett at 13:09, June 24th, 2010 under Blog, Columns, Science Columns |
[podcast]http://edwardwillett.com/wp-content/upLoads//2010/06/The-Yellow-Light-Dilemma.mp3[/podcast]
I went through a yellow light today. I’d glanced away at the wrong moment, looked up to see the light had gone yellow, and realized I couldn’t stop without slamming on the brakes and probably skidding into the intersection.
Later, I was crossing a street downtown when a van went through the yellow in front of me. It looked to me like the driver had plenty of time to stop—but no doubt he had his own excuse.
It’s a rare driver who doesn’t run through a yellow light on occasion, and in most cases it’s barely even a conscious decision. You have a split second to decide to brake, keep going...or even speed up.
So how do we make that decision?
A transportation engineering ...
Posted by Edward Willett at 16:36, June 15th, 2010 under Blog, Columns, Science Columns |
[podcast]http://edwardwillett.com/wp-content/upLoads//2010/06/The-Grills-of-Summer.mp3[/podcast]
We’ve had at least one nice day so far this spring, and based on previous years (although, of course, as they say about RRSPs, past performance is no guarantee of future results) we may get at least one more before first frost this fall, so there’s just a possibility a few people may break out their barbecues for some outdoor cooking in the near future.
In the U.S., the Memorial Day weekend at the end of May is seen as prime barbecuing time, which is probably why LiveScience, one of the science sites I frequent, recently answered that burning (sorry) question: “Why does grilled food turn black?”
But in order to build suspense, I’m going to refrain from answering that this early ...
Posted by Edward Willett at 14:57, June 7th, 2010 under Blog, Columns, Science Columns |
[podcast]http://edwardwillett.com/wp-content/upLoads//2010/06/A-Treatment-for-Ebola.mp3[/podcast]
A few years ago I wrote several books for Enslow Publishers in New Jersey for a series called Diseases and People. I covered meningitis, arthritis, hemophilia...and Ebola. My most recent book for Enslow, Disease-Hunting Scientist, also talks about Ebola, and some of the scientists who travel to the sites of outbreaks to help with containment efforts.
Ask someone on the street to name a particularly deadly disease, and there’s a good chance he’ll say “Ebola.” Yet of the diseases I wrote about, the biggest killer by far is meningitis, the bacterial form of which kills some 170,000 people every year, according to the World Health Organization. (And if you want even bigger killers, in sub-Saharan Africa alone tuberculosis kills some 5,000 ...
Posted by Edward Willett at 23:08, June 3rd, 2010 under Blog, Columns, Science Columns |
Now that we’re finally starting to see some hot weather, it won’t be long before we begin to see something else: thunderstorms and lightning (very, very frightening me! Galileo, Galileo...sorry, just a little Queen flashback).
It’s the lightning, of course, that makes thunderstorms thunder. If I may quote myself from a previous column, lightning “is a massive but short-lived electrical discharge in the atmosphere, usually several kilometres long.
“Lightning arises because of a charge separation in a cloud. A ‘charge separation’ just means that there are more electrons in one place than another. Cloud-to-ground lightning occurs when there are lots of free electrons in the base of the cloud. These electrons are discharged in what is called a stepped leader: ‘stepped’ ...
Posted by Edward Willett at 22:34, May 22nd, 2010 under Blog, Columns, Science Columns |
[podcast]http://edwardwillett.com/wp-content/upLoads//2010/05/Lasers-at-50.mp3[/podcast]
You know you’ve been writing a column a long time when the 50th anniversary of a major scientific discovery comes along and you realize you wrote a column celebrating its 30th anniversary.
But that’s exactly what’s happening this month. Next week (Saturday, May 15, to be precise) marks the 50th anniversary of the invention of the laser. And what follows is (with some slight revisions) the column I wrote to celebrate its 30 anniversary back in 1990. (But it’s OK: I promise not to trot it out again until the centennial.)
On May 15, 1960, a cylindrical rod of synthetic ruby placed inside a spiral flashlamp by American physicist Theodore H. Maiman in his laboratory at Hughes Aircraft Company in California momentarily ...
Posted by Edward Willett at 14:44, May 7th, 2010 under Blog, Columns, Science Columns |
[podcast]http://edwardwillett.com/wp-content/upLoads//2010/05/Celebrity-Endorsements.mp3[/podcast]
I don’t have much use for celebrity endorsements of, well, anything.
Oh, sure, it’s conceivable you could be a talented entertainer and also have an informed, thoughtful opinion that adds more light than heat to the debate surrounding a contentious issue, but just because something is possible it doesn’t mean it’s likely. And let’s face it, the mere fact you’re pretty good at pretending to be somebody else in front of a camera does not give you any special insight the rest of us lack.
I also resent lectures from affluent millionaires who use private jets like we use cars and have just expended vast amounts of energy making Pocahontas In Outer Space with blue people telling the rest of us we ...
Posted by Edward Willett at 8:04, May 3rd, 2010 under Blog, Columns, Science Columns |
[podcast]http://edwardwillett.com/wp-content/upLoads//2010/04/Curvy-Cars.mp3[/podcast]
In the 1940s and 1950s, cars had curves. From the 1960s through the 1980s, they tended to have sharp angles. But since then, they’ve tended more toward the curvy again...although I’m seeing signs of angularity one more.
Have you ever wondered why?
A German researcher at the University of Bamberg with the unlikely-yet-oddly-appropriate name of Claus-Christian Carbon did, and the results of his study were recently published in the journal Acta Psychologica under the title “
The cycle of preference: Long-term dynamics of aesthetic appreciation.”
Carbon suggests that two basic but somewhat conflicting human tendencies influence our reaction to automobile designs: a natural inclination to prefer curved objects, and a fascination with the new.
Normally, humans avoid sharp objects, because sharp objects—fangs, claws, knives, ...
Posted by Edward Willett at 10:34, April 23rd, 2010 under Blog, Columns, Science Columns |
[podcast]http://edwardwillett.com/wp-content/upLoads//2010/04/Wooden-Bones.mp3[/podcast]
It’s easy to not think very much about your bones. After all, they’re securely hidden away inside your body; not visible, except as hard lumps beneath your skin.
Funny thing, though: once you break one, it’s hard to think about anything else.
When first I wrote about bones, back in a 1993 instalment of this column, I told the story of my own broken-bone experience, for which I blame my big brother, Dwight (mainly because it was his fault).
I was seven years old and he was 12. We were both inside a big cardboard box that had held a refrigerator. For some reason, we’d decided it was fun to roll down the back steps inside this box. And it was fun, right ...
Posted by Edward Willett at 13:05, April 15th, 2010 under Blog, Columns, Science Columns |
[podcast]http://edwardwillett.com/wp-content/upLoads//2010/04/The-Mpemba-Effect.mp3[/podcast]
For all that we know about the physical world, there are a few phenomena that, though seemingly simple, continue to baffle us.
And one of the most baffling is the Mpemba Effect.
You may not know it by that name—I didn’t until I read
an article on New Scientist’s website last week—but you’ve probably heard about it. Heck, you may even have gotten in an argument about it.
The Mpemba Effect is the proper name of the counterintuitive fact that sometimes hot water freezes faster than cold water.
As New Scientist explains, Aristotle remarked on this phenomenon in the 4th century B.C., and Francis Bacon wrote about it in 1620. Just 17 years after that, in the very same year in which ...
Posted by Edward Willett at 10:15, April 6th, 2010 under Blog, Columns, Science Columns |