(a species of owlet moth (Noctuid)) Some caterpillars, after they emerge from their egg, can increase their weight by 25,000 times.

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Toys, games and puzzles

Liquid powered clock

Liquid clock

Up to 30 million batteries are used up in the UK each year – what a waste. Build your own clock that can run on fruit juice, fizzy drinks or even vinegar!

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Liquid powered clock

£ 7.83

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Building the clock encourages an understanding of basic electronics and how batteries, conventional or alternative power products work.

Have fun experimenting with the different liquids that can power the clock, and how long their energy lasts. This product has been designed to encourage such experimentation and discovery of the need for alternative power sources. The pack contains one digital watch module, a clock base, 2 plastic caps, 2 copper strips, 2 zinc strips, a liquid contained, a container cover, clock stand, base plate, pendulum, resistor, 3 spring connectors, a copper and zinc strip container and a pair of goggles.