What makes a rainbow?

• A rainbow is a multicolored arc made by light striking water droplets. The most familiar type rainbow is produced when sunlight strikes raindrops in front of a viewer at a precise angle (42 degrees). Light entering a water droplet is refracted. It is then reflected by the back of the droplet.

Why don't birds get electrocuted when they land on an electric wire?

• The copper in electrical wires is a great conductor. Birds are not good conductors. That's one reason they don't get shocked when they sit on electrical wires. The energy bypasses the birds and keeps flowing along the wire instead.