Some things were too hard to believe, however entertaining they might be to hear or read.

- Hal Clement

No one likes to be watched constantly by someone he can't see.

- Hal Clement

Maybe we've been taking nova precautions for a red dwarf.

- Hal Clement

What's the use of a high school education if you can't recall it when needed later on?

- Hal Clement

Human beings are prone to believe the things they wish were true.

- Hal Clement

The captain, thinking over this event afterward, realized that by his own lifelong standards he had a crew composed entirely of lunatics, with himsel…

- Hal Clement

Speculation is perfectly all right, but if you stay there you've only founded a superstition. If you test it, you've started a science.

- Hal Clement