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.

To measure the molecules that give food taste, you need a standardized eating machine. One has finally arrived, courtesy of food technologists in France (of all places!). Meet the mechanical masticator!

For the scientist or wanna-be who’s (almost) got it all: We scour the planet to find ancient wood, ancient-er ice, and a bamboo microscope. Dive into our holiday gift catalog slide-show!

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.

Want to make alternative fuel? Need to get electricity directly from organic slop? Bacteria may have the perfect answer.

How do dragonflies fly? How do bats catch insects hidden behind leaves? How do you make a temperature of 2 billion degrees? Why would anyone care?

How does an atomic clock work? How does an atomic fountain work? Is there a limit to the accuracy of an atomic clock?