10. Studies have found that a person is most likely to be involved in a fatal crash with an impaired driver during the hours of O 3:00 and 6:00 p. m.
Noon and 3:00 p. m.
O 7:00 and 10:00 p. m.
1:00 and 3:00 a. m.

It would be 1 o’clock and 3:00 AM because that is the earliest that the morning starts therefore they would be the most tiredest because of lack of sleep so my answer would be 1 o’clock and 3:00 AM

This is all you, but i can give you some topics that you could try. if it rained when you want to do something outdoors, it 'limits' that human activity. maybe you want to do an experiment that goes throughout the whole year and you have to have above freezing the entire year. this 'limits' your activity. i thought of those just off of the top of my head. something that gets to me that might be getting to you is you are thinking too hard about what to do. think simply, and if it is too simple, then bump it up just a little bit.

Why the planet stays in orbit is because of inertia (object stays in motion until a force changes it’s motion) also the atmosphere and gravity!