Geoffrey Burbidge, Who Traced Life to Stardust, Is Dead at 84

By DENNIS OVERBYE

Dr. Burbidge was one of the last giants of the postwar era of astronomy, when big telescopes revealed a universe more diverse and violent than anybody had dreamed.

Hadron Collider Set for Half Power

By DENNIS OVERBYE

CERN’s Large Hadron Collider is going to operate at half power for the next two years and then shut down for a yearlong repair session.

• Living Article: Large Hadron Collider

As Shuttle Flights Dwindle, a Series of ‘Lasts’ Begins

By KENNETH CHANG

The final planned nighttime liftoff is scheduled for the early hours of Sunday with Endeavour carrying the last major piece of the International Space Station.

Google Asks Spy Agency for Help With Inquiry Into Cyberattacks

By JOHN MARKOFF

The collaboration with the N.S.A. raises questions about how much Google knew when it said it might end its operations in China.

Evidence Builds on Color of Dinosaurs

By CARL ZIMMER

For the second time in two weeks, paleontologists provided insight into what the prehistoric creatures looked like.

U.S. Scientists Given Access to Cloud Computing

By JOHN MARKOFF

The National Science Foundation and Microsoft Corporation announced a three-year deal that would give American researchers much-needed computing power.

When Windmills Don’t Spin, People Expect Some Answers

By MONICA DAVEY

Plans to use wind turbines in Minnesota to provide power have run into a problem: apparently, it’s too cold this winter.

• Times Topics: Wind Power

Saving Tiny Toads Without a Home

By CORNELIA DEAN

Conservationists who have worked for years to sustain the Kihansi spray toad are unsure it can survive if it is returned to the wild.

• Video: Toads on the Brink

Books on Science

Tale of an Unsung Fossil Finder, in Fact and Fiction

By KATHERINE BOUTON

Two books examine the life of Mary Anning, who rarely got the credit she deserved for her early contributions to paleontology.

If You Swat, Watch Out: Bees Remember Faces

By SINDYA N. BHANOO

Researchers determined that the insect, like humans, used a technique that pieces together the elements of a face to form a recognizable pattern.

Scientist at Work | Andrew Witty

Ally for the Poor in an Unlikely Corner

By DONALD G. McNEIL Jr.

Through his work in poor countries, Andrew Witty, chief executive of GlaxoSmithKline, has positioned his company as the leader among drug makers in advancing world health issues.

In Haiti, Practicing Medicine From Afar

By MILT FREUDENHEIM

A video hookup between a patient on the scene and a doctor far away can save lives.

Update

Recovery Matches a Marathon Operation

By DENISE GRADY

After a surgeon removed a huge cancerous tumor from his abdomen, Robert Collison, 59, spent eight weeks in the hospital with infections and other complications.