Kolin Powick is a Quality Assurance engineer at Black Diamond and he has done a load of unusual gear tests using their machines. He has tested the effect of peeing on a rope, the effect of cutting part way through your belay loop, the strength of various anchor equalisation methods, the strength of different abseil knots and loads of other interesting tests.
Particularly interesting is a test he did on a very worn out anchor - the results are very surprising!
http://www.blackdiamondequipment.com/scene/beta/qc_kp.php
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