Waves play an extremely important role in many areas of our lives.
The ribs, the sternum and the spinal column form the skeleton of the chest.
Several ingenious instruments have been invented over the centuries to help in navigating the seas.
The first section of the gastrointestinal tract comprises the oral cavity, the pharynx and the oesophagus.
Standing bodies of water can form in depressions on the surface by both endogenic and exogenic forces, as well as by human activity.
This animation presents some animals and plants that lived between the Devonian and Permian periods (358-299 million years ago).
Massive accelerating or orbiting bodies cause ripples in spacetime. These are called gravitational waves.
Deforestation has a negative impact on the environment.
Learn the concept of colours, numbers, letters and shapes while playing
This stunning castle is situated in northern Croatia.
The Pula Arena, located in present-day Croatia, was one of the largest Roman amphitheatres in the Antiquity.
The American bison is the largest land animal in North America.
Waterfalls form where a river flows over a steep precipice in its course.
These special dolmens located in present-day Netherlands were built about 5,000 years ago.
The mosque, built in a distinctive architectural style, is the largest adobe structure in the world.
A regular square pyramid is a right pyramid with a square base and four triangular faces.
Many of the most important food crops we consume belong to the family of nightshades.
Remarkable civil engineering works to continue the Netherland's centuries-long fight against the sea.
Surface tension is the property of a liquid that allows it to obtain the smallest surface area possible.
The Hussites mastered the use of war wagons in the 15th century.