mr-damon/science

Which finger do you use to press a doorbell? Your answer will reveal your age almost as accurately as wrinkly hands, the way you dance, whether and where you've been pierced, and if you think "being poked" means a) a jab in the ribs, b) saying "hi" online, or c) something unmentionable.

If you're over 30, you'll probably press a doorbell with your index finger, while anyone under 30 may well use their thumb. That's because they've spent so much time flexing their thumbs when sending text messages on cellphones and gunning down baddies on games consoles. Thanks to all of that exercise, those thumbs have become stronger, nimbler and more dexterous, which is why they're likelier to use them more than their index fingers.