Update 2010-08-19

Update 2010-08-19:Reilly and Becky point out that this has

a 'starvation'

issue, where unpopular users could end up waiting indefinitely

because they give up before enough of them collect to qualify for

the next bus. Potential solution: you can swipe as many times as

you want, as often as you want. Each swipe tells the system "I'm

still here". The 20min ...