By just saying “OK Google,” you can quickly ask Google anything via your smartphone from unit conversions to sports results. While there are around 150 commands, and thousands of variants, many have remained a mystery until now.

The 25th anniversary of the world wide web will be celebrated around the globe this week. The milestone will be marked on Wednesday, a quarter of a century since it was first proposed in 1989 by British computer scientist Tim Berners-Lee.