That shows us how the Jews were persecuted, and how much many Jewish families suffered. Simply because they did not have an Aryan race, it means white skin and blue eyes, a pure German.
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.
