Surfing

If you're a surfer who doesn't want to be attacked by great white sharks, your surfboard should be as dark and stealthy as possible … right? Perhaps not, as a new Australian study suggests that a lit-up board may be better at keeping the sharks away.

A large-scale meta-study out of the University of Exeter has found that people who swim in the ocean have a higher risk of contracting ear ailments and gastrointestinal distress that non-sea bathers – with pollution suggested as a major factor.

A UK study has found that regular surfers were three times more likely to have an antibiotic resistant strain of E. coli bacteria in their gut than non-surfers, suggesting surfers are more likely to be at risk from these microorganisms.