It's Dusty Out There
There is no lower limit to the size of the solid particles that move around the Sun. Small asteroids grade downward into large meteoroids and then into smaller pebbles and so on down to the tiniest particles of dust. The most numerous particles are the…
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Engineering
Red Dot Replacing Cross Hairs
A bullet fired from a gun becomes subject to the pull of gravity and begins to fall the instant it leaves the…
Engineering
Drip, Drip Water Clocks
Water clocks were among the earliest timekeepers that didn't depend on the observation of celestial bodies.…
Biology
Man-Eating Plants
What's for dinner? A bowl of salad greens, corn on the cob and strawberry shortcake for dessert. And it's not…
Engineering
Hydropower Basics
Flowing water creates energy that can be captured and turned into electricity. This is called hydropower.…