The density of liquid can not only help with sciences, but can help you with finding out the murderer of a crime novel. For example, if the killer had poisoned the ice or drink, knowing what the density of liquid can help you find out what poison was used or the antidote.
In an outline capital letters can indicate many different things, but almost always they are used to signal a change in topic, or at lease a change in subtopic.
By playing on audiences' fears
It soundslike it should be number 2
