Certain mushrooms are poisonous and can be fatal for humans when consumed, while others are edible and used widely in cooking.
Lunar eclipses occur when the Moon passes through the shadow cone of Earth
The curvature of the lens of the eye changes when we look at a distant or at a near object, to ensure a sharp image.
Human blood consists of blood cells and plasma.
Machines converting the energy of flowing or falling water into useful forms of power were already in use in the Middle Ages.
This animation demonstrates geometric reflection, a type of geometric transformation both in plane and space.
The position and acceleration of the head is detected by the inner ear.
The excellent road and aqueduct system covering the whole empire reflects well the development of the Roman civilisation.
In the Tudor Era around 200 buildings were built on the bridge across the River Thames.
The Parisian prison became legendary after the Revolution of 1789.
The seminomadic lifestyle of the Bedouin adapted to the climatic and environmental conditions of the desert.
Cannons also appeared in naval warfare.
A series of fortifications built to prevent incursions from northern nomadic groups.
The army of Alexander the Great successfully deployed siege towers in its attacks against fortifications.
Skeletal muscles form the active part of the locomotor system: they move the bones they are attached to.
The ancient Roman arena became well-known for the chariot races held here.
The large intestine is the last section of our digestive track.
The double-decked, wide-bodied passenger aircraft can carry more then 500 passengers.
This animation demonstrates the structure and operation of electron microscopes.
Nuclear fusion will serve as an environmentally friendly and practically unlimited source of energy.