Every 27 million years, there is a much higher likelihood of a mass extinction. Some astronomers have proposed that these extinctions are caused by a small comet-disturbing star orbiting our sun, the so-called Nemesis hypothesis.
07/22/2010 12:33 pm
US recyclers are nervous about losing their largest market after China began enforcing new environmental laws this year.
Doing Good
What happens when ordinary people decide to pay it forward? Extraordinary change...
David Eads sits among old computer parts waiting to be recycled or refurbished by FreeGeek Chicago volunteers.
David Eads runs FreeGeek Chicago, 'an Apple Store for the rest of us'
FreeGeek Chicago gives volunteers hands-on training in restoring old computers to sell or recycle – while they earn credits toward taking home their own desktop or laptop free of charge.
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