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.

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Sparta.

 Sparta (Σπάρτη) was a city-state in ancient Greece. Also, Sparta had another name Lacedaemon (Λακεδαίμων) The city-state was situated in Laconia, in south Peloponnese, on the banks of the Eurotas river. 

There were their own laws, culture, architecture, military, government, society, citizens, and rules. Citizens of Sparta had rights and responsibilities.

Some aspects were different from other regions of ancient Greece. There were three groups in Sparta: the Spartans, the Helots, and the Perioeci. 

Spartan boys had military education. They started since seven years. Later adult men studied in a state system. Courage, military, discipline were important for soldiers. Spartans had their own uniform. Helmet, round shield, and sword were parts of it.

But Spartan empire was fall. Army lost the war.

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Ethics.

Ethics (ἠθικόν) means "moral nature" in Greek language. This science is a part of another study philosophy.

In Ancient Greece Plato and Socrates studied ethics. So, science about human behavior had a long and interesting history.

Ethics had a Golden Rule: "the principle of treating others as you want to be treated."

Students study this science during school lessons. Also, ethics can be part of social studies. Teachers teach children good behavior.

Etiquette had many rules about society and relationships. What can and can't people be asked about. How to start conversations in a place. Good manners are important for etiquette and ethics.

This science changed through history. Many different aspects had their own unique rules for behavior.

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Celts.

Celts were people who lived in Central and Western Europe. They had relationships with other civilizations, too.

These people visited neighboring places. Also, Celts had their own arts, mythology, culture, religion, laws, rules, and languages.

Timeline of Celts: beginning of Celtic culture (c. 1400 B. C. E.), Celts migrated (c. 900 B. C. E.), Iron age (c. B. C. E.-c. 600 B. C. E.), Celts settled in Iberia (600 B. C. E.), Celts defeated the Etruscans (c. 475 B. C. E.), La Tene culture (c. 450 B. C. E.), Celts entered in Italy (400 B. C. E.).

Some names of cities and countries had come from Celts. There are many things in museums about this civilization. Historians study Celtic history.

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Gymnastics.

Gymnastics are a popular sport. There are many different types of it, such as: rhythmic gymnastics, acrobatics, aerobics, and etc.

Especial equipment is used for this sport. Also, gymnastics has different rules. Gymnastics are part of Summer Olympic Games.

This sport is important for health.

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Basketball.

Basketball is a popular sports game. It appeared in XIX century. A basket and a ball are used for this sport.

The sport has its own rules and players. Also, this game is played during Summer Olympic Games. Teams have competitions between each other.

Basketball playgraunds have two baskets.

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Figure skating.

Figure skating is a winter sport. It appeared many years ago. This sport is played during Winter Olympic Games.

Figure skates are important for this sport. Also, figure skating has its own terms and rules.

Competitions can be as individuals or duos.

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