What if you could shrink yourself down to the size of 1 mm (0.04 in), about the size of a frog's egg? Actually no, there too many creepy crawly predators, so let’s go smaller.

So if people were the size of an atom, the entire population of the world would fit into a box about 1000th of a millimetre across. Presenter: Wow, teeny tiny. Well, is there a way to help us ...

So if people were the size of an atom, the entire population of the world would fit into a box about 1000th of a millimetre across. Presenter: Wow, teeny tiny. Well, is there a way to help us ...

Now we're talking about a black hole with the mass of an asteroid and the size of a hydrogen atom!" Bellinger said. "We think most primordial black holes would be outside stars, wandering the galaxy.

Magnetic domains retain their magnetic memory due to communication between groups of neighbouring magnetised atoms. Single-atom or single-molecule magnets on the other hand do not require this ...