The topic today is more about a weather type of dog that doesn't look like a dog at all... Sun dogs. You may have noticed ...

Light from the Sun ... rays are not parallel. A periscope uses two mirrors to allow someone to look over an obstacle. Submarines use periscopes to see ships on the surface of the sea.

Sunlight is plentiful on this remote Pacific island, which is a good thing because golden jellyfish don’t just enjoy basking in the sun—they need its light to survive. Solar rays nourish ...