A Moment of Science
Around New Guinea, there's a watery hill almost two hundred and fifty feet high. This isn't a hill on the ocean floor, but a hill on the ocean's surface.
NASA is planning to send astronauts back to the moon for long missions. How are the astronauts going to stay in shape in zero or low gravity?
What makes the sun shine? It's a question we rarely give much thought. However, there is a scientific explanation for this commonplace phenomenon.
It's not unusual for us to be struck by the amazing ways in which life on earth has adapted to its environment. Rooted potatoes are an example of this.
How do you know the sun didn't just explode? We aren't talking about the everyday, run-of-the-mill controlled explosion the sun is always doing, but a big boom.
Remember those inflatable clowns that stood about three feet high and had big red noses, meant for punching? Hit the clown as hard as you could, right back up.
Helium balloons fly because they're lighter than air. As you walk through air, it's natural to think of air as weighing nothing, though that is not the case.
As you might expect, planning astronauts' diets requires special considerations. Learn more on this Moment of Science.
The relatively small Earth, with its sizable moon, is the only planet we know of with life on it. Coincidence?
About twenty thousand years ago, during the last major ice age, a miles-thick ice sheet covered all of Canada and most of the northeastern United States.
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