How do emails work?

You’ve got mail! People send billions of emails by using the Internet. The first person to send an email, or electronic mail, was Ray Tomlinson. In 1971, Tomlinson was working on a computer system that would later become the Internet. He found he needed a better way to leave messages on the computers of his fellow workers. He used the @ sign to separate names of users from names of their computers on the network. So, today we address emails like this: janedoe@earthlink.net.

Why does my skin itch?

A mosquito bites you. Scratch! Scratch, scratch, scratch. Itching can drive a person crazy. The skin is the largest organ a person has. It covers 20 square feet. Skin is exposed to things that make people itch all the time, such as bug bites, poison ivy, scratches and cuts. Itching starts with some irritation. The itch is your body’s way of telling your brain that something is wrong. People automatically scratch in an attempt to remove the irritant.

How are HDTVs and standard TVs different?

HDTV stands for high-definition television. HDTVs work by picking up and decoding digital signals.

When a TV station broadcasts in high definition, the TV station changes pictures and sounds into trillions of bits of electronic data. An HDTV takes that digital data and changes it back into pictures and sounds. A standard TV turns radio signals into sounds and pictures. Radio signals do not carry as much information as digital signals. HDTVs have more lines of information and pixels (tiny colored dots) per picture than standard TVs, resulting in a clearer picture that is much sharper than a standard, non-HD, television.

Do female black widow spiders kill their mates?

Most people believe the female black widow spider kills and then eats her mate after mating. This is not always the case. Males often escape the clutches of the female once they finish mating. However, on occasion, the female will eat the male.