S01E10 Why do the leaves of tea collect in the center of a cup after stirring?

Today, we're tackling a common and curious observation: Why do the leaves of tea collect in the center of a cup after stirring? Have you ever stirred your tea or coffee and noticed how the loose tea leaves seem to gather right in the middle, seemingly defying expectations? It feels counterintuitive when you'd expect them to be pushed outwards, doesn't it? Let's dive into the science behind this baffling effect!100 Everyday Science Questions Answered