Like immense time-binding discussions, genres allow ideas to be developed and traded, and for variations to be spun down through decades.

In temperate zones, winter is the best insecticide; it keeps the bugs in check. The tropics enjoy no such respite, so plants there have developed a wide range of alkaloids that kill off nosy insects and animals.

Terraforming our moon will take many decades and vast abilities. Before we can begin, we'll have to master the resources of our solar system - especially transporting raw masses over interplanetary distances.

Invoking nature with its implied supremacy ignores that many cultures have fundamentally differing ideas of even what nature is, much less how it should work.

Mathematics cannot handle physical quantities like density that literally go to infinity.

Virtuality - connection without proximity - is a major attraction in both fandom and the Net. Nobody knows you're a dog through the U.S. mail, either. Fans could be utterly different in their fanzine persona, which may be why both fandom and the Net were invented by individualistic Americans.