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Katy Human

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Stem cells build corneas for testing

April 9, 2007 at 3:45 p.m.

Stem cells build corneas for testing

Dr. Dean Prina checks 18-month-old Ashby Burnetts ear as her mom, Suzie, helps hold her still. Ashby had anear infection and got a prescription for an antibiotic, although Prina says he tries to avoid overusing them.

Ear infections: Germs’ warfare

May 7, 2016 at 9:52 p.m.

Ear infections: Germs' warfare

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Droughts cast on Southwest

April 5, 2007 at 2:11 p.m.

Droughts cast on Southwest

Martin Lockley of the University of Colorado at Denver holds some of the bird tracks believed to be 125 million years old. The tracks show a toe formation seen in today's roadrunners, owls, parrots and woodpeckers.

Flocks of birds may have taken wing with dinos

May 7, 2016 at 9:24 p.m.

Flocks of birds may have taken wing with dinos

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Flame-plagued summers in forecast

April 2, 2007 at 2:46 p.m.

Flame-plagued summers in forecast

This hauntingly beautiful noctilucent cloud was photographed over the Juneau, Alaska, ice field in 1998. Once confined to Earth's poles, the clouds have been spotted above Colorado.

“Night-shining” clouds bring mystery

May 7, 2016 at 10:27 p.m.

"Night-shining" clouds bring mystery

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Why so few Latinos pursuing science?

May 7, 2016 at 9:15 p.m.

Why so few Latinos pursuing science?

Researchers replace an instrument tower that toppled because of melting ice. Scientists report numerous global-warming-related changes.

Researchers see global-warming signs near, far

May 7, 2016 at 9:50 p.m.

Researchers see global-warming signs near, far

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Gene firms gender technology opens the doggie door

March 7, 2007 at 7:21 p.m.

Gene firms gender technology opens the doggie door

At left, Jordan Smith and Nick Dubree cut core samples of methane hydrate into short sections to prepare them for transfer to scientists. The samples were brought up from beneath Alaska's North Slope permafrost layer. The samples yielded gas hydrate-bearing rocks such as the one above.

“Dirty ice” might power the world

May 7, 2016 at 9:56 p.m.

"Dirty ice" might power the world