Division of space by three intersecting planes in several different arrangements.
To calculate the volume of a tetrahedron we start by calculating the volume of a prism.
A prehistoric flying reptile, similar to birds. However, there is no direct evolutionary link between the two.
Regular dice can be used for solving statistical and probability exercises.
A hot air balloon is a balloon aircraft which is lifted by hot air.
Water turbines convert the kinetic energy of water into electric current.
This animation demonstrates the structure and operation of digital cameras.
Domesticated animals and crops originate from various parts of the world.
This animation demonstrates the main sources of soil pollution.
This animation demonstrates the structure and operation of different types of optical disc drives.
In summer, monsoon winds bring heavy rainfall from the ocean to the continent.
The oxygen cycle describes the movement of oxygen within its three main reservoirs.
An introduction to the relief and hydrography of China.
A string quartet consists of four string players, it appeared in the late 18th century.
Quetzalcoatlus was one of the largest known flying animals of all time.
The Aztec Empire was a despotic, militaristic state ruled by the tlatoani.
A long pipe in the centre of the tower penetrates the ocean bed until it reaches the layer that contains oil.
The withdrawal reflex is a spinal reflex that ensures moving away from potentially damaging stimuli.
The masterpieces of ancient Greek potters are important archaeological artefacts.
The building complex was one of the most important Benedictine abbeys for centuries.