This week in science we learned more stuff..........ahhhh....anyway we learned about how and why this happens.....ok when you shine a laser through the water glass the water will bend the laser so it will come out at a different angle when it exits the water glass. We also learned how the waves travel through the laser. When the laser is in the water they travel slowly due to denser particles and in the air they would travel faster because of the lesser particle density. Thats all i really remember so there you go.