Last week, Pres. Obama revoked the limits on studies of cells that can become any body cell. What was lost in eight years of limits on embryonic stem cells? What’s ahead?

Biology operates on the nanometer scale, and now ultra-small technology is producing monster benefits for genetic analysis, cell biologists, and the treatment of blinding glaucoma.

What you can’t see can still interest you. Archeologists use radar, magnetic, electrical gizmos to see through the ground, find places to dig.

Don’t know much about Science Education: A new survey shows three out of every four US adults do not feel they have a good understanding of science.

Hybrid cars and fuel cells increase auto efficiency and reduce pollution, but it’s a long struggle from the idea to the reality.

In 1997, Dolly was BIG NEWS. What did Dolly teach? Why did cloning attract so many oddballs, and what is the status of reproductive cloning and therapeutic cloning? The Why Files honors Dolly with a 10-year lookback.

To understand and protect the home planet: it’s no longer a key NASA mission. What will we lose as NASA turns its eyes toward the moon and Mars?

Test shows horrific math performance by U.S. students. What do mathematicians and educators say about teaching math? Are we near a resolution of the math wars? Is there one optimal way to teach math?

Bigfoot film was a fraud, a hoax, says man who played bigfoot in 1967 film. Why do so many people believe in cryptozoology?

Manned space flight is expensive — and risky. What causes accidents? Was the destruction of space shuttle Columbia a result of NASA’s failed safety culture? Are accidents normal?