...MIT grad Dave Whitlock has not showered in a dozen years because he wants to preserve bacteria on his skin.

Instead Whitlock sprays a mist containing live bacteria on his skin twice a day, Mother Dirt, which is sold by the Cambridge-based company he helped found, AOBiome, according to CBS Boston.

Whitlock said: 'I have not taken a shower in over 12 years.

'No one did clinical trials on people taking showers every day.

'So what's the basis for assuming that that is a healthy practice.

...

The scientist got the idea about 'good bacteria' when a woman he was dating asked him why her horse liked to roll on the ground and the dirt during the summertime, the New York Times reported.

Whitlock said: 'The only way that horses could evolve this behavior was if they had substantial evolutionary benefits from it.'