Now there is a development I'd not heard of before. Fascinating.
"Now there is a development I'd not heard of before. Fascinating."
Erasmus wrote: What they meant anyway was that momentum is conserved.
I was going to write that too, but I was busy with a prior comment. In physics you always have conservation of energy and conservation of momentum. Even though there's no physical contact, think of recoil from a firearm when it's shot.