Stories by Tim Beardsley

Drugs that turn off genes are entering human tests

A bioreactor grows cells that resemble real tissue

Sulfate pollutants may slow daytime warming

Advice about science is being heard in the administration

Bright future for a new photovoltaic cell

Could AIDS really be an autoimmune disease?

Who will have the right to examine your genes?

NASA wants to fend off doomsday asteroids

Ecologists seek better data on extinction

Who's controlling the world's largest nuclear arsenal?

Picosecond photography may reveal tumors

A peace accord in the seed wars

Researchers are closing in on the stem cell

How do very similar genes produce very different cells? It depends on which genes are activated and when. The elaborate chemical messages that control differentiation are now being deciphered.

Encouraging results in the search for an AIDS vaccine

Is more oversight needed to curb scientific cheating?

It'll take more than rain to end California's water woes

Policies on global warming and energy don't move critics

Do personality tests pick out bad apples?