I heard the most amazing thing in one of my lectures, and i just had to post it here since ive got no friends to tell. consider a box, and in the middle is a wheel, surrounded by air. now if you give the wheel a turn, it starts spinning. it will eventually slow down and stop. the air around it partially caused it to slow down - air resistance, and in doing so heated up ever so slightly. now when the wheels stopped, why cant the air then cool down and the wheel start spinning again. its perfectably able to with the 1st law thermodynamics (ie its just energy being transferred) but we all know it wont. id imagine theres a large amount of people deeply curious about this, so my next lecture is sometime during this week