Types of gears

Two meshing gears transmit torque during their rotational motion.

Types of bridges

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

Desktop computer

This animation demonstrates the structure and most important peripherals of desktop computers.

Comparison of real fruits and pseudofruits

The pericarp of real fruits develops from the carpel, while the pericarp of pseudofruits develops from other parts of flowers.

Southern wood ant

An ant colony consist of a queen, male ants and workers.

Large white butterfly

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

Secondary structure of proteins

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

Patellar reflex

The reflex triggered by the stretching of the thigh extensor muscle is the patellar reflex.

Dice

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

Hot air balloon

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

Water turbine, generator

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

Soil pollution

This animation demonstrates the main sources of soil pollution.

Location of origin of livestock and crops

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

Gametes

The zygote is the initial cell formed when two gamete cells are joined by means of sexual reproduction.

Volume of a tetrahedron

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

Native American settlement (Crow Nation)

The Crow are Native Americans who inhabited the Yellowstone River valley.

El Niño

A periodic climate pattern that occurs across the tropical Pacific Ocean every five years.

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.

Endocrine system

Glands of the endocrine system secrete hormones into the blood.

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