A clear: Hugo

A clear, middle-aged male voice speaking in an enthusiastic and articulate manner with a neutral British accent.

Script: Hello, quick question to start: Why are manhole covers round? Think about it. A square lid can fall through its own hole. A circle never can. That’s geometry saving lives, quietly, on every street. Lovely, isn’t it? Today I’ll show you five more designs where math is the secret ingredient. Spot the pattern before I reveal it. Ready? Game on.