An expert who studies or works in one of the sciences
Scientist
is something or someone that looks dirty or untidy
mess
A substance, such as water, that is not solid or a gas and that can be poured easily
liquid
Very small organisms that are found everywhere and are the cause of many diseases
Bacteria
A room or building with scientific equipment for doing scientific tests or for teaching science, or a place where chemicals or medicines are produced
laboratory
To try to hurt or defeat using violence
attack
A type of antibiotic (= a medicine that kills bacteria)
penicillin