Why is it so hard to break a habit?

If habits are really stuck, we don't think much about them -- we just do them! Some habits are good (like brushing your teeth in the morning) and others are not as good (like biting your nails). Today we find out what parts of our brains help us form habits and why it's actually super useful to not have to think so hard about everything. Gungador tries to break a bad habit, and we find out the best tips for ditching habits we want to leave behind. Plus: A brand new mystery sound and a Moment of Um that answers the question: "How do 3D glasses work?If you want to join the Brains On fan club and get a mailing of awesome temporary tattoos, have an adult sign up or update your mailing address at brainson.org/fanclubToday’s episode is sponsored by KiwiCo (kiwico.com and promo code BRAINSON) and Purple (purple.com/brainson10 and promo code BRAINSON10). See omnystudio.com/listener for privacy information.