The graph above tells us that this light will refract to a 40-degree angle in the water. If you point to where you see the bird through Snell's window, you'll actually be pointing at empty sky.

It might surprise you to know that the world's longest light rail line is located here in the U.S. in the state of California. Here's what and where it is.

Mini planetary parade to light up skies tomorrow - everything you need to know A mini planetary parade will see Jupiter, Mercury, Uranus, Mars, Neptune and Saturn align above the horizon Comments ...