News
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Altruistic twist in market economies
Democratic societies with market economies promote a moral ethic of cooperating with strangers who demand mutual sacrifices in joint ventures.
- Physics
Too speedy for gravity?
A new analysis suggests that five different spacecraft gained more speed as they flew past Earth than can be accounted for by Einstein's theory of gravitation.
- Astronomy
Supernova Outbreak: X rays signal earliest alert
Thanks to a lucky break and an overactive galaxy, astronomers report the earliest detection yet of a normal supernova—the explosive death of a massive star.
- Earth
Ocean ups and downs—the long view
Sea level has dropped about 170 meters in the past 80 million years, thanks in part to the thinning of ocean crust and the formation of land-based ice sheets.
