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CARL ZIMMER

Could the spread of tuberculosis come from seals? Study says yes

After a remarkable analysis of bacterial DNA from 1,000-year-old mummies, scientists have proposed a new hypothesis for how tuberculosis arose and spread around the world. The dis...

Hello, spring, you’re early again

Season arrives three weeks earlier than in Thoreau’s time

Rain forest’s diversity reflects battle to survive

The diversity of a tropical rain forest can be hard to fathom for people who have not seen one. Three acres of jungle may be home to more than 650 species of trees – more species than grow i...