Showing posts with label science. Show all posts
Showing posts with label science. Show all posts

April 9, 2007

Planet Earth again

Did you watch it last night? It was amazing once again. IMHO, it’s the most beautiful and informative show on TV right now. If you didn’t catch it, here’s what you missed:

  1. Birds catching fish 130 feet underwater.
  2. A sparring match between a penguin and a seal.
  3. Incredible time-lapse footage of starfish. They move so slowly that this would have been impossible (and ridiculous) to show, but in time-lapse it was quite nifty.
  4. Probably the most amazing super slo-mo footage ever captured of a great white shark leaping several feet out of the water to catch a seal (it’s about 1:20 into the clip, and shown again from a different angle at 2:09).

If you did watch, and you have HD, please invite me over so I can watch it in HD next week! I'll bring chips and salsa.

March 26, 2007

Planet Earth

If you’ve watched the Discovery Channel or any of its affiliates at all during the past few months, you’ve probably seen the hype for their “planet earth” miniseries. We watched the first episode last night, and I have to say that it was pretty incredible.

Many of the things they showed had never been filmed before, like a mother and baby giant panda in their den in the wild, and a snow leopard chasing down prey. I won’t give away any more about the content, because I’m sure they’ll repeat the whole series, and the Science Channel is rerunning the latest episode on the following Monday night.

Besides the excellent content and narration, I thought the cinematography was impressive. The quality of the film alone seemed to be well above your normal documentary—bright, crisp colors, and incredible definition. We don’t even have HD, and I was amazed.

Some of the shots left me wondering how in the heck they got them, like perfectly steady shots of a huge flock of cranes flying up near the peak of Everest. There was another of a grizzly scavenging for food on a rocky hillside. The shot started with the bear taking up nearly all of the screen, and zoomed waaayyyy back until the bear was smaller than the pixels on my TV, and the mountain was framed in the screen. I thought lens technology like that was limited to spy satellites and space telescopes.

They showed a lot of time lapse scenes of landscapes, clouds, starry skies, etc., but there was one that seemed just darn near impossible. It was a time-lapse-and-pan that showed a landscape through all four seasons. The camera panned across as the time-lapse whizzed the seasons by. I was blown away by how smooth it all was. That had to be a seriously slow and smooth rotational motor … and how the heck did they keep that camera in place and so steady for 12 months???

I definitely recommend getting your Battlestar Galactica fix some other way next Sunday, and tuning in to planet earth.

February 6, 2007

Frozen light switches, and science

With scary visions of house fires raging in my head, I decided it was best just to go for it and crack open (not literally) the frozen light switch. What I found on the inside was both relieving and puzzling. There was absolutely no ice, or even moisture whatsoever inside the wiring box. My first thought was “Yay!”, followed closely by my second, which was “How can that be?”. How could there be moisture and ice on the cover, but not inside the box?

Our carpenter friend is at the house helping us prep the fireplace, so I presented the puzzle to him. He immediately, and nonchalantly provided the answer. First, there is cold air coming into the house through the box (a project for another day) and cover. The air in the house, along with the surface of the cover, are much warmer, so when the cold air meets the warm air, they interact on the outside of the cover to form condensation (or more correctly, “dew”). The dew eventually freezes because the outside air coming in cools it to below freezing (keep in mind the air outside as I am writing this is around 0°F).

The air and the metal surfaces inside the wiring box, however, are much closer to the outside air temperature. The temperature differential of the outside air and the air and metal inside the box is not great enough to initiate condensation inside the box. No condensation means no dew, and no dew means no ice.

Tada.