Scientific knowledge is an enabling power to do either good or bad — but it does not carry instructions on how to use it.

Science is the belief in the ignorance of experts.

When a Caltech student asked the eminent cosmologist Michael Turner what his "bias" was in favoring one or another particle as a likely candidate to compromise dark matter in the universe, Feynmann snapped, "Why do you want to know his bias? Form your own bias!"

From a long view of the history of mankind the most significant event of the nineteenth century will be judged as Maxwell's discovery of the laws of electrodynamics.

If I say [electrons] behave like particles I give the wrong impression; also if I say they behave like waves. They behave in their own inimitable way, which technically could be called a quantum mechanical way. They behave in a way that is like nothing that you have seen before.

It is the fact that the electrons cannot all get on top of each other that makes tables and everything else solid.

Work hard to find something that fascinates you.