3rd class were doing some interesting investigations recently. Firstly, they took their own fingerprint by creating a black patch with their pencil on a piece of paper and then rubbing the top of their finger into it to blacken their finger. They then put selotape on that and when it was removed and stuck onto a clean piece of paper, they could see their finger print and the different patterns made.
Next they found their blindspot. They had a piece of paper stuck into their journal with a cross and spot on it. By focussing on the cross with one eye and bringing the page very slowly towards you, the circle "disappears" at a particular point which is your blind spot.
Next they tried to find their dominant eye. To do this, you hold your pencil out in front of you and line it up with a vertical object. Then you close one eye at a time. For one eye, the pencil appears to jumo to one side, away from the vertical object, which means the other eye is your dominant one.