In today's episode:

 - Does properly stored water ever expire? https://www.reddit.com/r/askscience/12c7841

 - As you age hair sprouts in places it didn't grow - what's happening with the follicles? Are they new or dormant ones awakening? https://www.reddit.com/r/askscience/12d6m9w

 - Why were some terrestrial dinosaurs able to reach such incredible sizes, and why has nothing come close since? https://www.reddit.com/r/askscience/128dnvx

 - Is the morphology between human faces significantly more or less varied than the faces of other species? https://www.reddit.com/r/askscience/12e988d

 - Why does respiratory rate increase during anaerobic exercise if muscles use glycogen as fuel, not oxygen? https://www.reddit.com/r/askscience/129fv5n