Why Bilinguals Are Smarter
The article is not written in an overly scientific register but here are some Plain English translations of what you will find there (a link to the story is provided below):
It makes your cognitive muscles stronger.
It gives infants more cognitive functionality than their monolingual peers.
It gives you the ability to think more quickly and hold more information.
It delays dementia in old age.
So, go be bilingual!