An earthquake is one of the most devastating natural phenomena.
Machines converting the energy of wind into useful forms of power were already in use in the Middle Ages.
Bats use ultrasound to navigate and hunt for prey.
Darwin's legendary voyage aboard HMS Beagle played a crucial role in the development of the Theory of Evolution.
This scene summarizes the main organs of the human body.
The train operates between Paris and southern Germany, its cruise speed is 320 km/h.
Before the emergence of motorised vehicles, letters and parcels were delivered by horse-drawn mail coaches.
Cereals are species of grasses cultivated for their edible grains.
The Suez Canal is an artificial waterway connecting the Red Sea and the Mediterranean Sea.
This animation demonstrates geometric reflection, a type of geometric transformation both in plane and space.
Inventions in the 18th century resulted in huge advances in the development of the textile industry.
An Ames room is a distorted room that is used to create an optical illusion.
An introduction to the relief and hydrography of China.
A type of rotary engine of high efficiency
Electrochemical processes in a lead-acid battery produce electric current.
The aircraft manufactured by the British de Haviland company was the world's first mass-produced commercial jetliner.
The first calendars and time-measuring instruments were already used by ancient Eastern civilisations.
The staggered conformation of ethane is more stable than the eclipsed conformation.
Learn the concept of colours, numbers, letters and shapes while playing
A ray of light is reflected or refracted at the boundary of two mediums with different refractive indices.