Objectivity.

Objectivity is something that relates to something or someone independently of the opinion of any individual.

I order to make an objective assessment, it's necessary to consider the process based on real facts.

Objectivity results in the same outcome even if different people give the rating. Subjectivity results in the rating being based on the person's opinion.

Source of image:

https://www.shutterstock.com/ru/image-photo/objective-subjective-word-alphabet-letters-on-2527794235?trackingId=f5549351-d2c5-4f41-9b13-6ce81c6e998e&listId=searchResults

Logic.

 Logic (λογική) is a science about rules and arguments. It means "mind" in Ancient Greek language. 

Also, logic is a part of other sciences, such as: mathematics and philosophy. Many scientists study logic.

There are different logical paradoxes. This is when contradictions in meaning meet each other.

In logic, reasoning and facts are important. Everything must be provable. On this can form a personal opinion.

The science has a long and interesting history.

Logic helps to analyze and do conclusions. It happens to be necessary in different life situations.

Source of image:

https://www.shutterstock.com/image-illustration/logic-complex-like-puzzle-pictured-word-1673219899

Source of image:

https://www.istockphoto.com/es/vector/conjunto-de-n%C3%BAmeros-cuadrados-dibujados-a-mano-multicolores-gm1307710780-397895574

Source of image:

https://www.istockphoto.com/es/vector/icono-de-l%C3%ADnea-de-planetas-y-espacio-planeta-saturno-con-sistema-de-anillo-gm1221777625-358269134