7,733 results
- Earth
Impurities clock crystal growth rates
A novel method for measuring tiny amounts of hydrogen-containing impurities allows researchers to determine growth rates along different directions in a quartz crystal.
- Paleontology
Was it sudden death for the Permian period?
The massive extinctions that came at the end of the Permian period could have occurred within a mere 8,000 years, which suggests a catastrophic cause for the die-offs.
- Humans
From the October 25, 1930, issue
alt=”Click to view larger image”> STEAM ACCUMULATORS BOOST POWER IN BERLIN Six hundred tons of steam stored under 190-pounds-per-square-inch pressure in huge steel cylinders help Berliners ride the trams to and from work and burn lights in the early morning. These cylinders are the new steam accumulators at the Charlottenburg power station, which are attracting […]
- Planetary Science
Europa’s freckles
Reddish spots and shallow pits that pepper the surface of Jupiter's moon Europa may mark regions where warmer and less dense ice percolates to the surface.
- Math
Fractured Granite and Fractal Prints
A rectangular slab of polished granite gives an impression of solidity and permanence. With its straight lines and glossy surface, it’s an elegant, humanmade artifact meant to stand as a timeless monument or serve as an impermeable skin for a sleek skyscraper. A fractal stone print. Nat Friedman A two-sided fractal stone print by Nat […]
- Earth
The Fires Below
Underground coal fires help shape the landscape on many scales and in many ways, some transient and some long-lasting.
- Earth
Eye of the Tiger
Recent research has upended a 130-year-old, previously unchallenged theory about how the semiprecious stone called tiger's-eye is formed.
- Archaeology
Early New World Settlers Rise in East
New evidence supports the view that people occupied a site in coastal Virginia at least 15,000 years ago.
- Earth
Sulfur Studies: Early Earth’s air was oxygen-poor
Analyses of ancient sulfide minerals and the modern organisms that create sulfides are giving scientists a better idea of what Earth's atmosphere and oceans may have been like billions of years ago.
- Planetary Science
Rocks on the ice
Pristine fragments of a meteorite that fell January 18 in the frozen Yukon and that remained frozen until they were delivered to a NASA laboratory may reveal much about the earliest days of the solar system.
- Humans
From the January 7, 1933, issue
ATOM BUILDING KEEPS STARS SHINING, SAYS A.A.A.S. HEAD The building up of other heavier atoms out of hydrogen stokes the internal heat of the stars, including the sun, Prof. Henry Norris Russell, Princeton University astronomer recently elected president of the American Association for the Advancement of Science, suggested in the Maiben lecture before the Association. […]
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Evolution’s Death Row: Groups surviving mass extinction still go bust
Groups of species may persist through major extinction events only to die off in the aftermath.
