Savais-tu que... Invention du papier

Chrsitopher explains that the Mongolians of the day had an excellent post system that allowed Factors to change horses in relay positions rather than having to wait for their horse to rest to continue their journey.

Christopher explains that the ancient peoples were very afraid of the Mongols who were known for their power and their attacks: they called them the Tartars.

Christopher explains that the Haruspices, members of the population of the Etruscans in ancient Italy, had the job of killing animals and watching their liver to know the future.

Christopher explains that the Etruscans, people of ancient Italy, knew how to work hot iron and had built a musical instrument that they had named horned.

Christopher explains that the Etruscans, people of ancient Italy, loved to eat, drink and party and were known to be quite plump.

Christopher explains that the Etruscans, people of ancient Italy, were inspired much of the Greeks for the architecture of their buildings.

Christopher explains that the men and women of ancient Italy wore the same clothes.

Lexie explains that the inflow and outflow of liquids in the human body are balanced by the kidneys.

Lexie explains that water helps the kidneys eliminate waste in the blood.

Lexie explains that prolonged listening to loud music could be detrimental to hearing.

Lexie explains what are allergies and various reactions of the human body.

Lexie explains that the liver is the only part of the human body that can regenerate itself.

Lexie explains and names the three layers of skin found on the human body, the epidermis, the dermis and the hypodermis.

Lexie explains that research conducted by a scientist has shown that vomit has the same odor as parmesan cheese.

Lexie explains that physical activity helps to be more alert and focused, which helps learning.