Children explore their enviroment
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18. Yeast does not only feed on glucose

Left: This drawing shows people harvesting grapes in Egypt 3500 years ago, squezzing them in a basin with their feet, collecting the juice in jars to leave it for some months. Yeast digests the glucose of the grapes which is transformed into wine.
2. Photo: A lot of household sugar is dissolved in Cola. Half fill an infusion bottle with Cola. Leave it for while, add a teaspoon of dry yeast. Shake and close it by an air baloon.
3. Photo: The yeast produced a lot of foan. Right: The yeast released a lot of gas lifting the baloon.