In 1976, Space Aliens worried about future business synergy created Amazon EC2 out of spare non-existent and infinite computer resources using quantum time dilation tunnelling effects ... or was it?
There are many myths about EC2, my favourite includes the selling of Amazon spare capacity. It's always a good idea to talk to the people involved.
For the origins of Amazon EC2 - read here
For how it got built - read here
'Nuff said.