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Parents of East Asian, East African and Native American descent are not usually surprised when their babies are born with distinctive blueish-gray or blueish-green birthmarks on their backside. Eighty to ninety-five percent of infants from these ethn
英语时差8，16
This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. Rats have long been guilty of spreading disease. But now they've gone into the diagnosis side. Because rats can be trained to spot tuberculosisand to do
Scientific American(十二)月
By Kevin Billinghurst Stockholm 09 October 2007 The 2007 Nobel Prize for Physics has been awarded to Albert Fert of France and Peter Gruenberg of Germany for discoveries that have helped fuel explosive growth in the storage capacity of computer hard
2007年VOA常速英语（十月）
propel this creature weighing as much as a grizzly bear, from a dead stop to a launch speed of 50 kilometers per hour all in a fraction of a second. I think that seeing a pterosaur like Quetzalcoatlus actually take off would have to be one of the mos
探索与发现2013年
Any simple organisms, alas, would have been baked away by the processes that turned ocean mud to stone. 哎呀，任何简单的生物都会在海洋污泥变成石头的过程中被烘烤没了。 Instead what we would see if we crunched up the rock
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