West Indian Ocean coelacanth

Living fossil, important stage in the evolution of tetrapods.

Simple harmonic motion and uniform circular motion

Simple harmonic motion can be considered to be the one-dimensional projection of uniform circular motion.

Church of St John at Kaneo (Ohrid, 13th c.)

The Orthodox church, situated on a picturesque cliff, was named after John the Apostle

Tower of Hanoi

The Tower of Hanoi is a mathematical puzzle.

Woodwind instrument

Woodwind instruments differ from brass instruments mainly in their reed.

Light and shadow

By varying the position of the light source, you can examine the shades projected onto the planes of the coordinate system.

Prehistoric armoured fishes

Extinct species of fish which had thick ´armour´ protecting the head.


This animation presents animals commonly kept as livestock and the primal cuts of their meat.

Precision agriculture

This animation demonstrates the use of modern technology in agriculture.

Nitrogen (N₂) (intermediate)

A colourless, odourless, non-reactive gas, it constitutes 78.1% of Earth´s atmosphere.

Relative position of lines and planes

This animation demonstrates the relative position of lines and planes.

Medieval towers and bastions

The structure of fortresses developed together with military technology.

Angle of inclination of lines and planes

This animation demonstrates the angle of inclination of lines and planes in various positions.


Pollen serves to fertilise the egg of plants. Pollen grains come in a variety of shapes and sizes, characteristic of the species.

Conic solids

This animation demonstrates various types of cones and pyramids.

Khối tròn xoay (bài tập)

Bài tập về sự hình thành các khối tròn xoay.

Late Roman soldier (4th century)

The prosperity of the eastern part of the Roman Empire started in the early 4th century, during the reign of Emperor Constantine.

Archimedes’ screw (3rd century BC)

The screw pump commonly attributed to Archimedes made irrigation much more effective

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