Types of bridges

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

Fuel cell

A fuel cell provides environment-friendly electric energy produced by the chemical...

Water turbine, generator

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

How does it work? - Ballpoint pen

The invention of the ballpoint pen made writing a lot easier.

Types of gears

Two meshing gears transmit torque during their rotational motion.

Desktop computer

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

Hero’s aeolipile

Hero of Alexandria is the inventor of the first steam engine, although he regarded it as...

DC motor

DC motors consist of a permanent magnet and a coil within the magnet, with electric...

Optical instruments

A wide variety of optical instruments are in use today, ranging from microscopes to...

The evolution of data storage

The capacity of data storage devices have increased at an incredible rate during the past...


Observatories are often built at high elevations to minimise the effects of atmospheric...

Alkaline batteries

In alkaline batteries electric current is generated by electrochemical reactions

Two-stroke engine

A two-stroke engine is a type of internal combustion engine with a cycle of only two...


This animation shows optical and radiotelescopes used in astronomical observation

How does it work? - Escalator

This animation demonstrates how an escalator works.

How does it work? - Air conditioner

An air conditioner cools the air inside by drawing heat away and releasing it outside.

How does it work? - Record player

This animation demonstrates the mechanism and operation of record players.

Measuring time

The first calendars and time-measuring instruments were already used by ancient Eastern...

Moon radar experiment (Zoltán Bay, 1946)

In 1946 a Hungarian scientist was the first person to detect radar echoes from the Moon.

How does it work? - Water tower

This animation demonstrates the structure of water towers.

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