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Water turbine, generator

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

Attack of Pearl Harbor (1941)

The United States entered World War II after the devastating attack by the Japanese navy.

Dividing Space into Regions by 3 Planes

Division of space by three intersecting planes in several different arrangements.

Volume of a tetrahedron

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

Hot air balloon

A hot air balloon is a balloon aircraft which is lifted by hot air.

Types of bridges

Types of bridges include beam-, arch-, suspension-, cantilever and truss bridges.

Types of gears

Two meshing gears transmit torque during their rotational motion.

Red deer

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

Types of surface epithelium

Surface epithelia cover the external and internal surfaces of the body

Male reproductive system

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

Oil molecule

Triglycerides containing unsaturated fatty acids are liquid at room temperature.

Secondary structure of proteins

Polypeptide chains are composed of amino acids and can appear in alpha-helix or beta-sheet form.


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


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

Grass snake

A type of snake with a characteristic spot on its neck.

Location of origin of livestock and crops

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

Large white butterfly

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

What is the time?

A game to practise the use of analogue and digital clocks.


The piano is one of the most popular instruments in the world. It is a chordophone which produces sounds mechanically.

Blood vessels

The three main types of blood vessels in the human body are the arteries, the veins, and the capillaries.

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