How various engine parts work

David sent this neat page with a bunch of motion GIFs on it describing how an engine works.

http://jalopnik.com/ten-gifs-that-explain-how-a-car-works-495996770

Look! Something shiny! How some textbook visuals can hurt learning

Look! Something shiny! How some textbook visuals can hurt learning: Adding captivating visuals to a textbook lesson to attract children’s interest may sometimes make it harder for them to learn, a new study suggests.