Green, from an illustration published in 1872

History

Samuel Green Freed Himself and Others From Slavery. Then He Was Imprisoned Over Owning a Book

After buying his own liberty, the Marylander covertly assisted conductors on the Underground Railroad, including Harriet Tubman. But his possession of "Uncle Tom's Cabin" turned him into an abolitionist hero

Victor Luckerson
Photographs by Rashod Taylor

Naked mole-rats are unusual for their long lives and resistance to cancer. Now, researchers suggest the rodents not only tolerate but prefer to be in low-oxygen air.

Science

Naked Mole-Rats Prefer Low-Oxygen Air That Would Kill Most Mammals, Adding to Their List of Death-Defying Superpowers