As part of their studies about micro-organisms the year sixes learnt about bacteria. We learnt that although some bacteria can make us sick, most bacteria helps us. Bacteria in our digestive system helps us to break down and digest food.

Did you know that about 60% of your poop is made up of dead bacteria?

We used yoghurt culture to investigate the conditions that bacteria like to reproduce. We mixed yoghurt culture with warm milk in one cup and milk alone in the other. Then we kept both cups at 50ºC for about three hours to allow the bacteria to reproduce.

We found that the cup with the yoghurt bacteria added became thick and smelled sour like yoghurt. The cup with milk alone remained unchanged.