Your teacher decided to run a marathon. During a marathon, participants all run 26.2 miles. Your teachers finishes the race in 5 hours. What is the average speed your teacher moved at during the race? (Include decimal points in your answer

high-sugar diet and high cholesterol

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

3. dark matter

empty space could also be a simple vacuum