News
- Animals
City Song: Birds sing higher near urban traffic
Birds in noisier city spots tend to sing at a higher pitch than do members of the same species in quieter neighborhoods.
- Earth
Protective Blanket: Atmosphere blocks many small stony asteroids
A new computer model that more realistically simulates the aerodynamic forces on an object as it passes through Earth’s atmosphere suggests that the thin layer of air is an even better shield than previously thought.
- Health & Medicine
Split Ends: Cancers follow shrinkage of chromosomes’ tips
Genetic tabs called telomeres, which normally protect the ends of chromosomes, become undersized in many tissues that later turn cancerous, new studies in people show.
