Episode 6 - As Time Goes By: Did you know that we are the only animals that actually grow old? Whereas most just hang around long enough to reproduce and raise their young, we are indeed all too stubborn for that. Here we get to hang out with a Kansas couple of 45 years, Bud and Viola, find out about hair loss (sorry guys, it's the testosterone that does it), changes in eyesight and other senses throughout our lives, menopause and how oxygen, that which we all need to live, is ironically also what causes so many of the icky parts of ageing, thanks in no small part to free radicals. There is also an extended look at the show's intro, which features a time line showing a number of mostly naked people ranging from age 0 to 102.