The Science Behind Slime
Slime is considered to be a Non-Newtonian fluid which means it behaves like both a solid and a liquid at the same time. The famous scientist (Isaac Newton) stated that regular liquids, like water, are only affected by temperature and pressure. If something breaks this rule and goes against what Newton stated, we call it Non-Newtonian.
Slime does not obey Newton's fluid rule. Non-Newtonian fluids react when a force is applied to it. This is what causes slime to behave so strangely when you play with it.
Other famous toys with this property include Silly Putty and Playdoh, which were developed decades earlier. Slime was not introduced until 1976. Playdoh was invented in the 1930's and Silly Putty in 1943.