are there experiments you can only perform once ever? if so, how would you plan for and conduct them?
@2ck A bit of a dark direction to take this in, but...
Many people have done experiments that they could never repeat: for example, such experiments are an important source of knowledge about which plants are safe to eat and which are not.
@eqyo heh. yeah, I'm thinking more like "which could we not repeat as a human species"