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Three pieces of broken deer antlers that were excavated 80 years ago at Stonehenge may tell scientists the date when the outer circle of gigantic stones was created.

Building Stonehenge took thousands of years. The outer Sarsen circle, made of huge stones the size of buses, is believed to have been created centuries after the inner circle of smaller bluestones was built.

Antler picks were used to dig holes for the stones. Because the antlers were once living matter, they can be tested by carbon dating. The exact site where they were excavated was recorded, at the base of two of the giant stones.
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Half of the 6,000 or so languages spoken in the world are threatened and human knowledge could be lost along with them. The ?Atlas of the World?s Languages in Danger of Disappearing? says dominant languages such as English, French, Spanish, Russian and mainstream Chinese are drowning out minority tongues at an fast rate.
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Tyrannosaurus rex, the killer dinosaur that lived about 85 million years ago, was not the swift hunter depicted in Hollywood movies. Instead of chasing its prey at speeds of up to 45 mph, as some studies have suggested, these dinosaurs may not have been able to run at all.

?These animals were no speed demons,? says John Hutchinson of Stanford University. He specializes in the evolution of movement and says the science of how animals move shows that big creatures do not move quickly. At about 40 feet long, up to 20 feet tall and weighing about 13,000 pounds, Tyrannosaurus rex was very big.
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A newly detected disk around the sun could narrow down our search for other star systems that might have planets orbiting around them.

Astronomers with the European Space Agency say they?ve found the first direct evidence of the bright dust ring, which is located beyond the orbit of Saturn. Young stars are known to have thick bands of dust, gas and debris. This dust gradually disappears into deep space, so if an older star such as the sun still has a dusty ring, some hidden source must be replenishing it. Replenishing the ring around the sun takes 50 tons of dust each second.
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