Esspee, I did one (a boring one) - but for my next PhD, I'd investigate that mysterious 'disappearing females' phenomenon related to weather conditions.
According to male friends, attractive women appear from nowhere when the sun arrives, then disappear completely when it's cold!
Then there's the closely related male 'turning head and gawping' syndrome, apparently an entirely automatic response.
Desperately sad story of the assisted suicide of a grieving mother
Utterly fascinating film on iplayer - Garden of 1000 bees




