Why do we forget things? Or why do we mix up certain details, like names? Well, according to experts, our memories run into issues because of four primary reasons – interference, a failure to store information in the first place, intentionally trying to forget a troubling experience, and in trying to access old information.

Though the numerical system that is used today was inspired by a Hindu-Arabic numeral system that was developed more than 1,000 years ago, it wasn't used until the 15th century! In the 15th century, the symbols started appearing throughout Europe and soon became widely accepted.

It was in 1970 that pop and politics met for the first time – the famous shot of Elvis Presley meeting President Richard Nixon in the White House will live on forever. And perhaps will be a reminder to pop stars that meeting politicians will NEVER be cool!