Time to explore the strange subculture of double-edged safety razors. I have 60 brands of razor blade to compare. I would have thought razor blades would all be razor-sharp by definition, but the forums seem to suggest otherwise.

The test bed for this poorly-designed, non-blinded and ultimately meaningless experiment will be the Henson AL13, made from aircraft-grade aluminium by the same company that precision-engineers components for the space industry.

The spreadsheet is ready. Let the blood-letting begin.