When leaves stop falling, fall starts leaving.

In biology, cells multiply by dividing.

TLA : stands for `three-lettered acronym'.

A wishful thinker's equivalence : if and if only . . .

`If the professor does not scold the student, then the student does not study.'

A statement being equivalent to its contrapositive, it must be equivalent to say

`If the student studies, then the professor scolds the student.'

By the induction hypnosis . . .

wlog = without lots of generality.

This is a snooperism.

Almost all mathematicians draw a cube like this , but this picture is impossible.

If any of the angles looked 90°, we should be seeing just 1 square face or 2 rectangular faces at most.

In German exit = Ausgang, emergency exit = Notausgang.

Un anneau sans idéal se réduit à un corps.

`To be or not to be'—that is the answer rather than the question.

The question was : `What are the square roots of 4b^2 ?'

The name of the Arctic has to do with its greatest inhabitants, polar bears :

in Greek ἄρκτος means `bear'.

It follows that Antarctica is an unbearable place.

Two wrongs do not make a right, but three lefts do.

Nursery teacher : `When ice melts, what do you get ?' One boy answered : `Spring.'