In today's episode:

 - ELI5: If humans have been in our current form for 250,000 years, why did it take so long for us to progress yet once it began it's in hyperspeed? https://www.reddit.com/r/explainlikeimfive/12f6oz1

 - ELI5: Why do some animals, like sharks and crocodiles, have such powerful immune systems that they rarely get sick or develop cancer, and could we learn from them to improve human health? https://www.reddit.com/r/explainlikeimfive/12aozmj

 - ELI5: Is there a scientific reason not to shower during a thunderstorm? https://www.reddit.com/r/explainlikeimfive/12ci3hx

 - ELI5: Why aren't bamboo products like Toilet Paper/Paper towels considerably cheaper than their tree counterparts? https://www.reddit.com/r/explainlikeimfive/12bl1hg

 - ELI5: Why do wine bottles do that little indent at the bottom of the bottle https://www.reddit.com/r/explainlikeimfive/12eig0e