Laughter, for example, can actually boost your immune system and stave off infections; tears, on the other hand, are used to clean our eyes but scientists don’t actually know why we produce them when we’re upset! Want to learn more about exercise, your body, or the complex organs within it? Then check out the facts in this section!
Did you know that 23% of people regret their tattoos, with the biggest regret being a tattooed name? Well, whether you have a tattoo or not, here are 30 astonishing facts about tattoos that you probably don't know!