What makes an invention great? Sometimes it solves a problem you didn’t think could be solved. Skyscrapers can’t turn invisible. Pens can’t write in midair. Paraplegics can’t walk. Except now they can. And sometimes an invention solves a problem you didn’t know you had. Maybe you didn’t realize you needed to eat a doughnut and a croissant at the same time, or resurrect an extinct frog, or turn your entire body into a living password. Now you do. Check out TIME’s list of the best things that were invented in 2013.