Fake smiles and real smiles are controlled by two different parts of the brain.
Can you tell if someone is smiling even if you aren't looking at them, but just hearing their voice?
Have you watched a baby smile and simply fallen in love? It turns out there's some cool science behind why a baby's smile is so heart-warming!
If you have a dog, you may have noticed that sometimes it seems to be smiling. Of course, we know that dogs don't really smile, right?