So why do shadows matter? Well, before clocks were invented, the ancient Egyptians used sundials to tell the time with shadows – three and a half thousand years ago! We may have technology to ...

And yes, I sleep on the roof – it’s cooler. Hmm, I wonder what time it is? Oh no – look at the sundial! I’ve slept in again. I’m going to be late for school! We invented 60-minute clocks ...