What was a fact taught to you in school that has been disproven in your lifetime?

1. Eggs are good for you. Eggs are bad for you. Some eggs are good for you, but not too many. Eat all the eggs you can. Eggs are bad for you again. Eggs are good for you again. etc...etc...etc...
   — Jakebob70


2. That it's impossible for girls to be colorblind. In 8th grade science, my teacher started showing our class those circles made of different colored dots. If your vision is normal, you see a number. If you're colorblind you either don't see a number or you see a different number. When I started calling out different numbers than others in my class, he started trying to like, stump me. He couldn't believe I was colorblind. He was shuffling through all his cards with the circle-dot-numbers. He just about refused to believe it. This was in 1996. I've learned since that it's still incredibly rare for girls to have colorblindness, but we're out there!
   — MrsDoctorSea


3. The US will be switching to the metric system soon.
   — thissaysotherwise






4. That cracking your knuckles will give you arthritis.
   — loverturf


5. That things you do bad in school go on your "permanent record"
   — mre4you


6. That you will fail high school if you don't learn to write in cursive...
   — JacksoRelaxo






7. In high school my teachers would preach that in college, a professor would never accept any assignment that was turned in a nanosecond after the due date. Experience has taught me that some professors are very understanding of their student's workloads and schedules, and will work with you and give extensions, accept late work, etc.
   — browncoat63