As my colleague David M. Herszenhorn reports, scientists are poised to take some highly anticipated samples from a deep subglacial lake in Antarctica, saying on Wednesday that they had succeeded in boring through more than two miles of ice. The state-financed broadcaster Russia Today posted video of the researchers at the frigid Antarctic outpost, including clips of them snowmobiling around the endless expanse of ice and snow and watching supply planes land. What evolutionary secrets Lake Vostok — named after the Russian research station above it — may hold after being sealed under ice for millions of years has tantalized...