Tell me something I don't know.

Here is an excerpt from a recent BBC.com article:

Women's hands 'harbour more bugs'. Women have a greater range of different types of bacteria on the palms of their hands than men, US research suggests.

The study also found that human hands harbour far higher numbers of bacteria species than previously thought. Using powerful gene sequencing techniques, researchers found a typical hand had roughly 150 different species of bacteria living on it. The Proceedings of the National Academy of Sciences study found bacteria types varied greatly between individuals.