Even if you’re not swapping spit, you’re definitely swapping microorganisms. Researchers in a new study found that people who lived together shared 26% of the same oral microbes. This was regardless of the relationship — participants included siblings, parents and children. Romantic partners shared even more oral microbes (44%), likely due to kissing. “Your microbiome is not just yours as an isolated entity, it is partly a reflection of the people you live with, and theirs is partly a