math

A railroad drawbridge over a canal is to pivot upward, so boats can pass under it. For trig students this is a good problem. The end-plate of the bridge span, where it lifts away from the rest of the track, cannot be due vertical in its rest position. If it were, the plate would jam as the span...

Originally this was just a vague impression which solidified when I tried to explain it to a friend, but it seemed to have an impact so I figured I should post it here, of course slightly altered so its not so specific to my friend: Many people out there hate life, and many of those have good...