Steve Mould

Steve Mould is a British science presenter and author who makes videos about science. He is known for spotting strange physical effects and then building simple experiments to work out what is really going on.

Each video usually starts with a puzzle, such as an odd teapot, a pump with no obvious moving parts or water that seems to solve a maze. Steve then builds models, often with clear plastic or 3D printed parts, so viewers can see the mechanism working. Many videos involve fluids, mechanisms and materials, which are the bread and butter of engineering. Explanations are clear and patient, and Steve is happy to admit when a first idea turns out to be wrong.

Some highlights include:

A demonstration of the Wirtz pump, a centuries-old coiled pump that lifts water using only rotation.

An explanation of the clever mechanical valve that stops a fuel pump nozzle when the tank is full.

Steve revisits his famous chain fountain theory after it was tested in space.

The channel has over 3.6 million subscribers, and its most popular video has been watched around 50 million times.

Steve Mould shows the core engineering habit of asking how something works and then testing it. The fuel nozzle and pump videos are especially good examples of mechanical design solving a real problem. It suits anyone drawn to mechanical engineering, product design or physics. Many of the demonstrations could be repeated safely in a school lab or at home with simple materials.