Hunt for the Oldest DNA
Two decades ago, Eske Willerslev had a radical idea: Could DNA, the fragile chemical code of life, survive intact in frozen sediment for millennia? Fellow scientists called him crazy, but the Danish biologist set out to prove everybody wrong, and his perseverance paid off. After years of failure, Willerslev and his team recovered the genetic traces of a lush forest ecosystem from before the ice age, more than two million years ago.