1. mammoths
1. Mazur thinks the chance that frozen sperm from mammoths could be used to fertilize a related species is near zero.
2. Scientists believe the mammoths only became visible because global warming had melted the permafrost - earth that normally remains frozen all year round.
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3. Back in the days when men were men and mammoths were wooly, language was a simple affair.
4. Two mammoths are attracting plenty of attention at the Beijing Museum of Natural History.
5. But there are twice as many differences between the genetic makeup of chimps and humans as those between elephants and mammoths.