Science expert Dan Riskin sits in on This Is Going Well, I Think and bursts with enthusiasm about the indirect way an invasive ant forced lions to change their diet. Then Dan shares how cave people used a woolly mammoth tusk tool to make rope. David derails with a question about penises that sting, which leads to Dan explaining the horrifying mating habits of the bedbug. Dan goes over a list of all the things in nature that can stab you. David asks about narwhals. And finally, Dan tells a horrifying story he plans on telling a bunch of kids.

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