摘要
You’re standing in line at a coffee shop,ready to order,when your cellphone goes off.It's from your bike:"Someone is stealing me!"Ignoring the eager barista,you burst from the cafe to spot a bike thief in action.He panics,and bails.Let’s take another scenario.You click your helmet into place,hunch over the handle bars,ratchet up to a high gear and begin pedaling so fast it feels like your knees will hit you in the nose.
