News
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Earth
Mapping the Frozen Sky: Study looks at clouds from both sides now
By combining simultaneous observations from satellites and ground-based instruments, scientists can generate a three-dimensional map of the size and distribution of ice particles in a cirrus cloud.
By Sid Perkins -
Animals
Male bats primp daily for odor display
For the first time, scientists have described the daily routine of male sac-winged bats gathering to freshen the odor pouches on their wings.
By Susan Milius -
Health & Medicine
Stem cells repair rat spinal cord damage
Using embryonic stem cells from mice, researchers restored some movement in paralyzed rats that had undergone a crippling spinal injury.
By Nathan Seppa -
Physics
Time’s arrow may make U-turns in universe
Time may run backwards for isolated chunks of matter in our universe and that reversed state could be probed gently from the forward-going realm without disturbing the time arrow.
By Peter Weiss -
Chemistry
Antibiotics may become harder to resist
Drug designers have developed new tactics to make it harder for bacteria to survive exposure to antibiotics.
By Janet Raloff -
Mom’s eggs execute Dad’s mitochondria
Sperm may tag their own mitochondria for destruction inside the fertilized egg.
By John Travis -
Earth
Smoggy Asian air enters United States
High concentrations of ozone from Asia reach the United States.
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Physics
Computers Crunch Quantum Collisions
Physicists have mathematically described what happens when an electron collides with a hydrogen atom, accomplishing a longstanding goal.
By Oliver Baker -
Snooze Power: Midday nap may awaken learning potential
A brief daytime nap may block or even reverse learning declines that occur during extended practice of a perceptual task.
By Bruce Bower -
Physics
Loud Loop: New explanation of whip-snapping unfurls
The wake of a loop zooming along a whip may silence the faster-moving tip so the loop actually causes the whip's loud bang.
By Peter Weiss -
Health & Medicine
Eat Broccoli, Beat Bacteria: Plant compound kills microbe behind ulcers and a cancer
A chemical abundant in broccoli and certain other vegetables kills ulcer-causing Helicobacter pylori bacteria in the laboratory and inhibits stomach cancer in mice.
By Ben Harder -
Animals
Sniff . . . Pow! Wasps use chemicals to start ant brawls
Wasps sneak around in ant colonies thanks to chemicals that send the ants into a distracting frenzy of fighting among themselves.
By Susan Milius