Dan Blumstein was gently holding a yellow-bellied marmot pup, conducting research, when he first heard one scream. "I was sort of shocked by this scream and almost dropped this animal," he says. "I ...

The sound of fear is universal. Screams of mammals have similarities — irregularities in the sound — that are meant to draw attention. OK. It's almost Halloween - that one day a year you are ...

With the fast-approaching celebration of Halloween, fearsome frights and horror flicks are as much a staple as jawbreaker-related trips to the dentist. From the ghosts that swing from the trees to the ...