Which discovery has most improved your life?

LINK to Guardian article in response to Science Museum poll

The most important discovery, in my view, was that of life's, and especially our own, evolutionary origins, which must now be extended, with some urgency, to an understanding of human civilization itself.

This, before civilization's self-exploitation through our misplaced and perverted, but rationalized and thus unrecognized, Darwinian behaviour patterns (which the power structures of state and economy developed to facilitate) leads to its, and our own, self-destruction.  

My second choice, after Darwinian evolution, is MONEY.

Can you imagine having to pay for everything in cows or bits of cow, or shoes, or whatever it is you produce yourself . . ?!