Tim Machino is the Science Nerds' maths expert. He is 11 years old. He loves solving puzzles and using numbers to figure out cool things. He's like a maths superhero. He is friends with the Science Nerds Juli, Electro, Max, Chloe and Astra, and he also likes Gizmo the robot. Tim has a younger brother called Jeff who is 8 years old. Tim's catchphrase is that something is "bad mojo" or "good mojo".