When water in the ocean or a lake looks clean and sparkling, you just want to jump in for a swim, but did you know water is full of creatures that are so tiny you cannot see them? Find out what they look like and what they are doing in the same water that you want to swim in, or even drink. What we can easily see all around us is only a fraction of what is really there. The microscopic world in and on animals, plants, the ground we walk on, and even our own body is full of tiny things that are scary, mysterious, and amazingly strange.