The meteor that caused at least 1,000 injuries in Russia after a startling and powerful daytime explosion one week ago has been identified as a chondrite. Russian scientists who analyzed fragments of the meteor, whose large size and well-documented impact made it a rarity, say that its composition makes it the most common type of meteor we encounter here on Earth.
Originally published on Wed February 20, 2013 1:04 pm
By Andrew Prince
Satellites are powerful tools. They beam our TV signals, phone calls and data around the planet. They help us spy, they track storms, they power the GPS signals in our cars and on our phones. But they also send back striking, totally disarming images of planet Earth.
This set of images is all about showing off the "beauty of the Earth," says Lawrence Friedl, the director of NASA's Applied Sciences Program and the editor of a project called Earth as Art. "We want people to look at these images and say, 'How did nature do that?' "
Flowers are nature's ad men. They'll do anything to attract the attention of the pollinators that help them reproduce. That means spending precious energy on bright pigments, enticing fragrances and dazzling patterns.
Now, scientists have found another element that contributes to flowers' brand: their distinct electric field.
Anne Leonard, who studies bees at the University of Nevada, says our understanding of pollinator-flower communication has been expanding for decades.
Bees are democrats. They vote. When a community of bees has to make a choice, like where to build a new hive, they meet, debate and decide. But here's what they don't do: they don't filibuster. No single bee (or small band of bees) will stand against the majority, insisting and insisting for hours. They can't.
The HeLa cell line — one of the most revolutionary tools of biomedical research — has played a part in some of the world's most important medical advances, from the polio vaccine to in vitro fertilization.
Originally published on Tue February 19, 2013 10:36 am
Credit Sandra Mu / Getty Images
If you've ever played around with one of those carbon or water footprint calculators, you probably know that meat production demands a lot from the environment — a lot of oil, water and land. (Check out the infographic we did on what goes into a hamburger last year for Meat Week.)
But have you thought about your meat's phosphorus footprint? Probably not.
In Youngstown, Ohio, the owner of an oil and natural gas drilling company has been charged with a violating the Federal Clean Water Act. He's accused of dumping tens of thousands of gallons of drilling waste water into a storm sewer that eventually runs into a local river.