Seeds and germination

Dicotyledons have two embryonic leaves (cotyledons), while monototyledons have only one.

Safety equipment of bicycles

The highway code contains rules concerning the safety equipment of bicycles.

The Knights Templar (12th-13th century)

One of the most important religious military orders, formed in the era of the Crusades.

Trench network (World War I)

Static warfare was one of the characteristics of WWI

The urinary system

The urinary system serves for the removal of harmful and useless materials from the body.

Evolution of the bicycle

The changing bicycle, at first mocked as a toy, is a true mirror of the technical development over the last three centuries.

How does it work? - Ballpoint pen

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

Thermal power station (hydrocarbon fuel)

Thermal power stations convert energy released during the combustion of fossil fuels or renewable resources into electricity.

Muscles of the upper arm

The arms are moved by flexor and extensor muscles.

Jupiter

Jupiter is the largest planet of the Solar System, it has two and a half times the mass of all the other planets combined.

Hero’s aeolipile

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

Ancient agriculture in the Nile Valley

Ancient Egypt was called the ‘gift of the Nile’, since the river played an important role in the rise of Egyptian civilisation.

Phases of the Moon

During its orbit around the Earth, the visibility of the Moon's illuminated part constantly changes.

Battleship (HMS Dreadnought, 1906)

HMS Dreadnought revolutionised battleship-building in the 20th century.

Ziggurat (Ur, 3rd millennium BC)

Ziggurats were typical terraced step pyramids used as temples in ancient Mesopotamia.

The skull and the spine

The two main parts of the central nervous system, the brain and the spinal cord are protected by the skull and the spinal column.

Bones of the lower limbs

Bones of the lower limbs are connected to the trunk by the pelvis.

Carbonic acid (H₂CO₃)

Colourless, odourless liquid produced by dissolving carbon dioxide in water.

Medieval farmhouse

Farmhouses in the Middle Ages were simple, single-storey structures built from earth, mud and wood.

Neurons, nervous tissue

Neurons are cells specialised for transmitting electric signals.

Added to your cart.