Just thinking about food sends signals to your digestive organs to prepare them for a meal. >>
North American Arctic Terns fly about 40,000 kilometers, or 24,000 miles, each year - about equal to the distance around the Earth. >>
No matter how cold a snow-producing cloud is, if it has a source of water, it can build big snowflakes. >>
Meteorologists have made huge advances in understanding the forces and conditions that determine a hurricane's path. >>
Not nearly as many people see the aurora australis, or southern lights, as do its northern counterpart. >>
As long as Earth spins steadily - and moves at a constant rate in orbit around the sun - you as an earthly passenger move right along with it. >>
White dwarf stars - celestial objects that are slowly cooling - are like a cosmic clock. >>
Although the sun is about 400 times larger than the moon, it is also about 400 times farther away. So the sun and moon are nearly the same size as seen from Earth. >>
Unfortunately, there is still no way to predict when an earthquake will strike - only where they are most likely to occur. >>
It is indeed possible - if an asteroid of an appropriate size passed at just the right speed, and encountered Earth at just the right angle. >>