What you watch on TV
Internet-connected televisions can collect data on everything you’re watching and sell it to advertisers – and many are set up to do it by default. (To keep your information private, turn off data sharing in your TV settings.)
Whom you live with
Your dirt reveals whether there are more men or women in the household (the sexes shed different types of bacteria). By examining the fungi in your dust, scientists can also predict where you live, down to about a 240km range.
Whether you are outgoing
It’s written on your front door. According to colour experts, a red front door means you’re not afraid to say what you think. A blue door says you’re naturally at ease in most situations. Green broadcasts your traditional values, and black means you’re probably consistent and reserved. Inside the home, extroverts tend to choose open, spacious furniture layouts. If you’re introverted, you probably decorate with soft, solid colours and muted patterns.