i think me and my friends find this a lot funnier than most people because we're SCIENCE NERDS and all of the experiments and the little fake facts they throw at you are just so ridiculous we can't help but laugh.
also imo earl chip pointed out the not-that-funny jokes/quotes. "Water" is a lot better than "maths," I think, especially the dumb queen elizabeth stuff. I don't think every second of these clips are hilarious, but there are many scenes that are really really good!. The water and egg experiment in "Water" is definitely the best part of that episode. In "germs", the experiment where they grow stuff in a petri dish is awesome.
If you don't like this one, then

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edit: btw, I just noticed there's a lot of visual stuff that is hard to see in the youtube. Download the dvd rips of the episodes if you can.