A mirror doesn't lie to you. Don't ever sell mankind short by saying there's anything they can't do. No creature can smoke without breathing. It's increasingly difficult to judge, in science fictions, where the science ends and the fiction starts. It takes a lot of courage to kill oneself with a bludgeon.
Infinity is, in fact, impossible fully to grasp.
There isn't any plug that can stop time from running out of you. There are few despairs sheerer than that of a writer who must create and can't. The skill and fun of beating your opponent is more important than the amount you win. The likelihood of getting a lift in a car is in direct proportion to its age and condition of decrepitude. Physical possessions tie you down.