One of the oldest lions in US dies at Smithsonian Zoo

SCENE FOOTAGE: A Frontier Airlines plane hit a pedestrian on the runway of the Denver International Airport during takeoff. (Source: KCNC)

Hantaviruses do not spread easily between people. (CNN, NEJM)

A crossing guard went viral after recounting a car crash at a school playground. (KYW)

A crossing guard went viral after recounting a car crash. (CNN, KYW, Instagram|@NBCPhiladelphia)