I went to a great talk today by David Goldstein, which I might write about further later since he said many of things of considerable interest. But I had to quickly point to an interesting paper he mentioned: Parachute use to prevent death and major trauma related to gravitational challenge: systematic review of randomised controlled trials. The main conclusion:
We think that everyone might benefit if the most radical protagonists of evidence based medicine organised and participated in a double blind, randomised, placebo controlled, crossover trial of the parachute.
Make sure to read the statement regarding the authors' contributions.