A Moment of Science
A skydiver's body is in a delicate balance. Gravity tugs her downward with a constant, relentless force, while air resistance pushes her upward.
Every skydiver experiences two different forces: the tug of gravity and the upward push of air resistance.
Believe it or not, you can trick the muscles in your arms into effortlessly pulling your arms up, as if helium balloons were tied to your wrists.
When fighting in Iraq, American soldiers encountered numerous oil well fires. Learn how specialized fire fighters put out the fires on this Moment of Science.
Household drugs like painkillers, antibiotics and hormones enter the water system in many ways. For example, some animal feeds contain antibiotics and might flood into rivers with run-off, while other antibiotics are flushed or dumped down sinks and toilets in homes.
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