Hidden inside a sea of 02s is the number 20 waiting to be spotted ... the 20 lies nine rows from the bottom somewhere in the middle row of the grid. If you like your puzzle intact, look away now ...

Recently, a maths brain teaser posted by @Lost in Numbers on Facebook has taken the internet by ... They’re a fun way to ...

Some numbers are so unimaginably large that they defy the bounds of modern mathematics, and now mathematicians are closing in ...