Scientific Coincidence
I'm on the train on the way to the Ultimo Science Festival and the kids in front of me are discussing what happens when the train is moving and you jump into the air. Why don't you move, they ask? "Cause there's no wind pushing you back ay", "Nah I reckon it's cause when you jump, like it's different", "Like with gravity and stuff", "Yeah, like what if you had the train all around here and there was a big gap in the middle, then the platform would be here..."
Isn't that great? Hypothesizing and even thought experiments!
Later: "how many millimeters in a kilometer?" (I kid you not the coincidence is startling), "that's easy, 100! No, 10000", "nah like there's 1000 metres in a kilometre isn't there? How many millimeters in a metre?". Dad pipes up, "just, just don't worry about, okay". Grr.
After some silence, "It's 10000! Yeah cause it's times isn't it? Is that multiply? Okay 1000 times... is it 100 millimetres in a centimeter?"
Go Scientific Curiosity!