Coffee physics.
"It takes more than 150 people to make a cup of coffee, from farmer to barista. But if that final person makes a mistake, your precious coffee is wasted. Michael Allen investigates whether physics can help us brew smarter so we don’t waste a product that’s threatened by climate change"
https://physicsworld.com/a/coffee-with-a-splash-of-physics-how-to-make-the-most-out-of-your-brew/