You have two coins of equal size on a table, situated end to end vertically. If you roll the top coin around the bottom coin until it returns to its original position, how many times will it have rotated?
What must be in the oven yet can not be baked? Grows in the heat yet shuns the light of day? What sinks in water but rises with air? Looks like sand, but is fine as hair?
A variation of this brain teaser includes laser printers (they were invented by Gary Starkweather) and bulletproof vests (invented by Casimir Zeglen using silk, though modern vests use Kevlar, so it’s halfway right).
You dance in a circle of joined hands, And though they spin away I can always see your face, In the world, no matter where I am, One look at you and I know my place.
An analogue clock is a circle, and the hands of a clock are joined at the middle. The hands can point away from you, but the clock face is always visible. No matter where you are in the world, you can probably find a clock. “One look at you and I know my place…in time!”
Thanks to Helena for creating this and sending it in.