[JenB]

Me too, even when it's completely wrong SF. I loooove the chapter at the beginning of "Tunnel in the Sky" where he explains all the science and societal results of that science and it's just this big unapologetic "here's how it works, read this and then we can get back to the story" bit.

[Rose in RoseBear]

Or the whole sequence in Doors Into Summer where he goes on and on about mechanical linkages.

Soooo cool!