After studying an unusual solar eruption from 2017, researchers think they've pinpointed the likely origin of mysterious heartbeat-like signals emitted by the sun during solar flares.
The skull of a medieval Lombard woman found in central Italy shows signs of having undergone two trepanations — surgeries to make holes in the head. But why she underwent the painful procedures is unknown.
The Coros Pace 2 is a great entry level fitness tracker for runners.