Why Is It?

Mosquito Dunks

July 3, 2003

How do those mosquito-killing dunks work? (one type uses a bacterium, the other a hormone)

June 26, 2003

rerun

June 19, 2003

June 17, 2003

How far away can scientists see into the universe? (about 13 billion light years away)

June 12, 2003

June 10, 2003

What exactly is petrified wood? (it's a fossilized tree [or part of one] -- where the wood has been …

May 27, 2003

How do dryer sheets work? (Releases ingredients that neutralize static charge)

May 20, 2003

Why is it that if pipes inside your house can freeze during winter, that fire hydrants outside dont …

May 15, 2003

What is the make-up of a natural light bulb rather than a normal one? (the mix of colors it gives …

May 13, 2003

Why does the wind gust when it blows over flat terrain? (natural variability in its creation)

April 24, 2003

rerun

April 22, 2003

rerun