I don't get this attitude. For all the reasons Donna outlined above, this is the ultimate HIMYM-style episode. If you don't like it, how can you like anything that came before? (As for running out of plot (which is a valid criticism for S7…this episode was all plot).

Jesus. Time really IS a flat circle.

"That's what the fuck life is — one vile fucking task after another."

He's a live-action Sterling Archer.

Except, how are they going to make those lenses, medicine, appliances, etc.? If you took 40,000 random human beings right now, and put them on 50, I don't know, cruise ships, and sent them off to an uninhabited island and told them to re-create modern technology using only what they have, would they be able to? Would…

The catch in his voice when he realizes that, for all his reaching to be a world-famous scientist, it's his knowledge about farming — what he learned from his father — that makes him valuable now — just amazing.

I loved him as Mark Greene's dad on ER.