Before the emergence of motorised vehicles, letters and parcels were delivered by horse-drawn mail coaches.
The inner planets of the Solar System are terrestrial planets while the outer planets are gas giants.
The Giza Necropolis is the only one of the Ancient wonders still intact.
Seawater, as an external force, plays an important role in shaping coastlines.
An average Egyptian dwelling consisted of regularly arranged rooms.
The liver is a vital organ that plays an important role in the digestion of fats, detoxification and metabolism.
Electric motors are present in many areas of our everyday lives. Let's learn about the different types.
Machines converting the energy of wind into useful forms of power were already in use in the Middle Ages.
Observatories are often built at high elevations to minimise the effects of atmospheric turbulence
Surface tension is the property of a liquid that allows it to obtain the smallest surface area possible.
The capacity of data storage devices have increased at an incredible rate during the past decades.
Many of the most important food crops we consume belong to the family of nightshades.
This animation demonstrates how solar energy can be utilised.
This animation demonstrates the structure and most important peripherals of desktop computers.
The pericarp of real fruits develops from the carpel, while the pericarp of pseudofruits develops from other parts of flowers.
These special dolmens located in present-day Netherlands were built about 5,000 years ago.
The Hussites mastered the use of war wagons in the 15th century.
A wide variety of optical instruments are in use today, ranging from microscopes to telescopes.
One of the most important monocot crops.
Oil tankers appeared in the late 19th century; today they are among the largest ships.