There are many opportunities to use 'four-digit PIN numbers' in our daily lives, such as credit card PIN numbers, smartphone passcodes, and PC unlock codes. In all cases, we should use four-digit ...

Adding larger numbers in your head is not always easy. If you need to use pen and paper, then the column method is a good way to add. It involves writing one number beneath the other, so that the ...

Subtracting larger numbers in your head is not always easy, so you can use the column method to take one number away from another. You write the larger number above the smaller number, so that the ...

The strength of Apple’s revised encryption scheme in iOS 8 hinges on users choosing a strong passcode or password, which they rarely do, according to a Princeton University fellow. Apple beefed up the ...

A brain teaser shared on Instagram has been keeping people hooked to their screens. It features three hints on the basis of which one needs to find a four-digit number. A question on the brain teaser ...

Six-digit security PINs provide little more security than four-digit ones, according to research by a German-US team. It has everything to do with psychology. “Mathematically speaking, there is a huge ...