As most of you know, I ride my bike to work every day. Well, technically I bike for about 40 minutes a day before, between, and after two public bus rides totaling 1.5 hours. The buses get me over the hill to the coastal oasis of Santa Cruz and then up a big hill to UCSC. The first, hour-long trip is simply infeasible to bike in the mornings (okay yes there are some people who do it, but they are super heroes). But the second bus trip I take with my bike, the thirty minute one, is not impossible to bike. In fact, I've biked it more times than I can count over the past three years, but it is hard and sweaty and painful for average humans and doing that first thing in the morning takes mustering up some serious energy. So, I just take the bus. But the other day, I pedaled up the hill to campus without barely breaking a sweat. I glided up it, enjoying the view and smiling. There was no pain. And I was going about 14 miles an hour while doing so. How is this possible? I was riding an...