Photographs or mystery objects can be used to start children thinking.
You can capture children’s imagination with a striking image or photograph that illustrates the starting point for their investigation.
A mystery object or material will arouse children’s curiosity e.g. To introduce Runny Liquids, hold up a broken spoon, and say to the children, "I was using this spoon in a liquid and it broke. What do you think I was doing, and why do you think the spoon broke?"
The photograph here shows some rock salt.