The next time you find yourself freaking out on the road — ZOMG GO GRANDMA, THE SPEED LIMIT IS 35 WHICH MEANS YOU CAN TECHNICALLY GET AWAY WITH 44 — take a moment to consider where that stress is coming from. OK, scratch that. We both know you won't take a moment. You'll honk your horn and make like bumper cars.
But now, while you're semi-calm, read this. The hormones that trigger what we claim to be "stress" are affected by all types of seemingly harmless things such as background noise (seriously?) and smartphones (duh). Just so you're not completely blindsided by any future freak-outs. You're welcome.