This half term we have had two Science students from Sheffield University visit our classes. They taught us about micro-organisms. We learnt that they are all around us. Some are helpful, some are not! We tested how much bacteria was on our hands by pressing on agar plates which the students took to their lab to grow. We were surprised just how much had grown when they returned the next week. We discovered that the bacteria kept in colder temperatures didn’t grow as fast as those in hot conditions.