The zygote is the initial cell formed when two gamete cells are joined by means of sexual reproduction.
This animation demonstrates the anatomy of tulips, daffodils and snowdrops.
During swallowing food travels from the mouth cavity into the stomach.
The earliest version of the lute appeared in ancient Mesopotamia.
More than one million people died in the WWII Nazi death camp located in present-day Poland.
The Greek fleet owed their success to their good tactics and their fast and easily manoeuvrable ships.
One of the positive influences of the Ottoman invasion of Europe was the construction of baths.
The animation offers a summary of the history of aviation from the Middle Ages.
One of the greatest archaeological finds of the 20th century was the tomb of the Egyptian pharaoh.
The Hypothalamic-pituitary axis is the regulating centre of our endocrine system.
Its architectural solutions and ornamentation rank this mosque among the masterpieces of Islamic art.
Quetzalcoatlus was one of the largest known flying animals of all time.
Every era and every culture has specific residential buildings.
The battle of the Greek-Persian War became famous for the heroic sacrifice of the Spartan soldiers.
Solomon's temple became one of the most important symbols of Jewish architecture.
Smoking severely damages the respiratory system, it may cause COPD or lung cancer.
The dodo is an extinct species of birds that used to be native to the island of Mauritius. It has become the symbol of extinction.
The staggered conformation of ethane is more stable than the eclipsed conformation.
The relationship between the pressure, volume and temperature of ideal gases is described by the gas laws.
Electrochemical processes in a lead-acid battery produce electric current.