If you're trying to get to sleep, you should not
a. think about stressful topics while in bed
b. make sure the bed is comfortable to you
c. have a glass of milk 30 minutes before bedtime
d. spend 10 minutes doing yoga before getting into bed

If you're trying to get sleep, you should not A. think about stressful topics while in bed. If you think about stressful topics, your brain will focus on that rather than on how sleep you are. Thus, you won't be able to fall asleep but rather mull over these topics that give you anxiety. You should do all of the other options before bed, because they will make your sleep more enjoyable.

Answer label all waste as a biohazard;

Pretty much everywhere: walking requires friction, driving around curves, steering a car with the steering wheel, starting fire with a stick, objects moving along a conveyer belt.