A network security key is basically your Wi-Fi password — it's the encryption key that your password unlocks to allow access to the network.

To make a Wi-Fi password, or change your current password, you'll need to access your router's settings page using a computer.

A study suggests that the first of seven key pyramids in Egypt, the Step Pyramid of Djoser, was built using a hydraulic lift. Dated to about 4,500 years ago, this would move up the introduction of ...