I was watching an interesting TV-show on Crop Circles yesterday. A bunch of
MIT students were given the task of creating a crop-circle showing all the
characteristics of 'real' crop-circles -- which apparently includes
high-heat damage to the wheat stalks, radiating pattern of iron deposit,
etc. Their job was to do it overnight, within a set time limit. The
students did a pretty good job, actually.

Sometime late in the show, one of the students was calculating area and
volume (or something similar) of the crop circle, and he was doing it on a
slide rule. So, at the time of the show, slide rules were still used by at
least one geeky student at MIT.

Cheers
A