Volume of a tetrahedron

To calculate the volume of a tetrahedron we start by calculating the volume of a prism.

Types of synovial joints

Synovial joints can be categorised by the direction of movement they allow.

Dice

Regular dice can be used for solving statistical and probability exercises.

Types of surface epithelium

Surface epithelia cover the external and internal surfaces of the body

Water turbine, generator

Water turbines convert the kinetic energy of water into electric current.

Viking chieftain (10th century)

Viking leaders were elected from tribe members by the right of blood or an act of bravery.

Location of origin of livestock and crops

Domesticated animals and crops originate from various parts of the world.

Male reproductive system

The reproductive system consists of organs which work together for the purpose of reproduction.

Mallard

This animation demonstrates the anatomy of birds through the example of mallards.

Common carp

Freshwater fish used as food in many parts of the world.

Chlorophyll

Chlorophyll is a photosensitive green pigment found in plants; it absorbs light energy, thus plays a vital role in photosynthesis.

Red deer

Red deer are even-toed ungulates, ruminants. Their males have spectacular antlers.

Soil pollution

This animation demonstrates the main sources of soil pollution.

Monsoon wind system

In summer, monsoon winds bring heavy rainfall from the ocean to the continent.

Large white butterfly

The large white butterfly is a common species of butterflies, through which we demonstrate the anatomy of butterflies.

Cockchafer (Maybug)

The cockchafer (or maybug) is a widespread bug in Europe. Its larvae, known as chafer grubs are considered a pest.

Oxygen cycle

The oxygen cycle describes the movement of oxygen within its three main reservoirs.

The phosphorus cycle

The phosphorus cycle describes the movement of phosphorus through the lithosphere, hydrosphere, and biosphere.

European mole

Moles are small subterranean mammals with modified, spade-like forelegs.

Inca warrior (15th century)

The Incas´ rudimentary weapons were inadequate in their struggle against the Spanish Conquistadors.

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