After John Mack died, his archive of interviews concerning the Ariel UFO encounter was meant to be made available to the public - two decades later, we are still waiting.
Ian Stevenson set out to scientifically investigate reports of reincarnation - while he failed to find any credible cases, his efforts warrant respect.
Evaluating claims of ESP and other psi abilities can provide the perfect opportunity to grapple with some counterintuitive, but incredibly important, maths.