scissors science

Scissors may not be cutting-edge science but nothing cuts an edge like them. They are wonderful machines, but can become four-edged devices in the hands of evil vivisectors.

Photo description: Mechanical study of a pair of scissors, with drawings and static equations calculating the ratio between the applied and the output force. There are written sentences like 'machines multiply forces!', 'The great power of levers', 'I'm a lever lover' (from the Sesame Street song sang by Sutton Foster) and 'levers are clever'.