I never knew they were lost.
"Give me a lever long enough, and I shall move the world."
~Archimedes
~Archimedes
Actually, he said something to the effect:
"give me a lever long enough and a place to stand and I can move the Earth."
Although he never, as far as we know, ever said anything like Newton's laws of conservation of force or momentum, it appears that Archimedes had some intuitive understanding of them. In any case, you can't have a lever without a fulcrum.