We have built over 100 different science museum exhibits, mostly for the Cambridge Science Centre. These have included electrical generators, ball runs, stick insect cages, logic blocks and dissected household items.

We think that 95% of the time a small exhibit can teach and fascinate your visitors just as much as a large exhibit. Plus they have the advantage of being much cheaper, and you can get 2-3 times as many in the same space, allowing your visitors to explore more science, and making it more likely they will find something that inspires them.

A table with a big lazy susan in the middle to take materials to make things with.
The Cartesian diver is a classic demo, which involves both pressure and buoyancy.
A beautiful phases of matter analogy that can show what is happening to the particles during phase changes.
Ball or marble runs are fun, but when you can reposition all the parts, and the balls are blown up to the top again, they are brilliant!
If you put a current through a wire near a magnet, it jumps sideways. The basis for all electromagnets, and therefore motors, solenoids etc.
A very simple exhibit using heat sensitive plastic to let you see the heat from your hands or other parts of your body.
Visualise the sound wave you are creating as you talk or sink. Do different sounds produce different waves?
As a magnet moves near a coil of wire it generates a voltage, if it is moving fast enough it can produce some light.
This is a very bizarre tactile illusion. Put you hands either side of a series of wires, and pull them across, your other hand will suddenly feel smoother than velvet.
Why do TVs have red, green and blue dots, find out with this classic exhibit.