How do heat pumps work when it's freezing outside?
How can cold outdoor air heat a warm home? A simple guide to heat pumps, refrigerant, the compressor, and what changes in freezing weather.
Good questions.
Clear answers.
The science behind things you use, notice, and wonder about. Start with a question. Leave with a picture of how it works.
How does GPS know where you are without the internet?
GPS doesn't need to ask a satellite where you are. Learn how timing, four satellites, and a clock correction let your phone calculate its location.
How do maglev trains float, and what pushes them forward?
A beginner's guide to magnetic levitation: how Japan's superconducting maglev lifts, stays centred, and moves without driving wheels.
Nuclear fusion vs fission: what's actually different?
Fusion joins light atomic nuclei. Fission splits heavy ones. Here's why both release energy, why the Sun uses fusion, and why a reactor is harder.