There are two ingredients inside a lava lamp: a watery liquid, and a waxy compound that collects at the bottom when the lamp is turned off.
Researchers have been studying the effects of UV rays on whales in the Gulf of California for over three years...
The magnificent sight of the Milky Way, for example, can now only be seen in rural areas. Why do we shine light up into the sky in the first place?
If you've ever glanced skyward, you've probably noticed the sheer numbers of stars. Some are tiny, barely visible points. Others radiate strong white light.
Why are letters reversed in a mirror? Try this experiment with pen and paper.
You may notice in a mirror that words are backwards in the reflection, but it's actually more than words that are reversed; it's everything!
Photocopying machines are fairly complicated devices, but the basic principal is pretty simple.
Why can't we landlubbers focus underwater without goggles?
This is partly due to pollution, but even in the cleanest air the sky is lighter near the horizon due to the effect of earth's atmosphere on sunlight.
How many times have you heard a jet plane going over but not been able to find it even though you were looking toward where the sound was coming from?