give me 3 examples of paradox,plz?

Answer 1

to acheive peace, you must prepare for war.

The grandfather paradox: http://en.wikipedia.org/wiki/Time_paradox

The Mpemba effect (really cool because it was rediscovered by a high school student) http://en.wikipedia.org/wiki/Mpemba_effect

Answer 2

a parodox is when by changing something you would change something else that affects that ie you could not go back in time and kill yourself because then now in the present you would not exist to go back in the first place so simply put a paradox is a conflict of ideas or events