It’s impossible to burp in space
When you burp on Earth, gravity keeps down the solids and liquid from the food you just ate, so only the gas escapes from your mouth. In the absence of gravity, the gas cannot separate from the liquids and solids, so burping essentially turns into puking.
About half of your body is bacteria
That’s right. A 2014 study estimates that the human body consists of 39 trillion bacteria and 30 trillion human cells. In the past, researchers thought we were more bacteria than human with a ratio of 10:1. While this new calculation is probably closer to the true numbers, it’s not a hard fact.
Men are more likely to be colour blind than women
The genes responsible for the most common type of colour blindness are found on the X chromosome, the National Eye Institute explains. Even if women have the genes on one of their two X chromosomes, a properly functioning gene on the other one makes up for that loss. If men inherit the gene on their only X chromosome, they’ll become colour blind.