What it's like to ride an electric bike that uses the same batteries as a Tesla Model S

I was terrified to try it. The last time I had been on a public bicycle was in Seville, Spain, where I got hit by a motorcyclist who failed to look on a turn.  This time, I was climbing on an electronic bike with a motor of its own that could take me up to 20 m.p.h. hurtling through the streets of San Francisco. All I had to do was twist my right hand on the throttle.  One reason people (like me) don't bike to work is safety. The other reason? Sweat. Some people don't want to arrive drenched ...