Here's What Makes a Dripping Faucet Go 'Plink'

It's the sound of water droplets falling one after another, maybe from a leaky faucet or through a cracked ceiling. It's the kind of sound that can keep you up all night. University of Cambridge engineer Anurag Agarwal feels your pain. While visiting a friend in Brazil in 2016, Agarwal couldn't ignore the water that steadily dripped through the leaky roof and fell into a bucket below. "It was a rainy period, and the downfall was torrential," he says.