I went outside and heard Sidge asked, "Hey Mom. You wanna free breeze?"
Took me a moment to figure out what that meant. But Sidge and my brother's two daughters -- in for a few days visit -- had put their bikes upside down and were letting the wheels generate a breeze in the garage.
They then decided to move their work outside of the garage. Baylee dropped out and returned to the air conditioning -- so only Charleigh and Sidge were left with their "invention."