Smiles are just as contagious as laughter - typically passing on to three people

A smile is as infectious as laughter and typically passes on to three people, according to research.

A poll of 2,000 Brits looked into how far positivity can spread, with three quarters claiming a smile from someone brightens their day.

And 28% value it so much, they feel being on the receiving end of a grin is worth more than a gift.