Central Park is turning into a squeak show. New York City is losing the rat war in the iconic green space — where the vermin are so brazen, they routinely raid baby strollers for snacks at a besieged ...

If you tickle a rat's belly, it squeals with laughter. However, we are unable to perceive this laughter as its frequency, around 50 kHz, exceeds the range of human hearing. Neuroscientist Jaak ...