Overhead

I believe that this is a universal truth.

In any mathematics department, if a speaker wants to connect a laptop to an overhead projector, in the first instance, it will not work. At least three people will emerge from the audience, claiming to know the solution to the problem, either by pressing buttons on the projector or by some bizarre combinations of keystrokes on the computer. This will not work. The solution will be found approximately 10 minutes into the allocated time for the talk and it will be one of two things:

a) restart the computer.

b) put the talk onto a different computer and start again.