Silphion cured diseases and made food tasty, but Emperor Nero allegedly consumed the last stalk. Now, a Turkish researcher thinks he’s found a botanical survivor.

Meanwhile, the researchers remain determined to find more amphibians believed to be extinct. "We have faith," Sánchez-Nivicela says. "We think they're still out there." ...

Thylacines — marsupials known as Tasmanian tigers — were declared extinct decades ago, but efforts to find one in the wild ...