Own a rock that can float on water ! Put your "floater" in a bowl of water and watch!
This "Floater" stone is really called pumice. Pumice is an igneous rock that was created when a volcano spewed out super-hot, highly pressurized lava. This causes a high number of gas bubbles to be trapped in the lava . Then rapid cooling and depressurization causes these gasses to escape, leaving the lava full of holes and foamy. The result is pumice, a very light rock filled with tiny holes or hollow cavities. So light that it can float!
We use pumice in many ways: in landscapes, concrete, polishes, toothpaste, pencil erasers and cosmetics. As an abrasive it is used in scrubbing powders and even to scrape off dry skin!