This is an illusion that surprised me the first time I saw it. I was visiting a beautiful waterfall in Tennessee, and had never heard of the Waterfall Effect. The results were quite surprising and delightful.
This is a cool science trick that will let you know the number of sections in an orange (or other citrus fruit) before you slice it. It makes a fun trick that seems like magic, but is actually just a matter of careful observation.
As you learn the process of science, wouldn't it be great to be able to watch expert scientists at work? By watching the way they approached new problems, tested ideas, and revised their views based on the evidence they collected, you could improve your understanding of how science works.