A handful of 28,0000-year-old woolly mammoth cell parts were recently "woken up" for a short time in a new experiment, but cloning the ice age beasts is still a long way off.
The road to bringing back the mammoth — a giant that went extinct at the end of the last ice age — is filled with barriers.
If scientists could resurrect extinct animals — such as the dodo, Columbian mammoth or Tasmanian tiger — should these animals have different names that distinguish them from the original species?
It was 20 years ago this week that scientists announced the first successful cloning of a mammal — the now-famous sheep Dolly.
Today marks the 20th anniversary of the announcement of Dolly the sheep, the first mammal cloned from an adult cell.
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