Dicotyledons have two embryonic leaves (cotyledons), while monototyledons have only one.
The highway code contains rules concerning the safety equipment of bicycles.
One of the most important religious military orders, formed in the era of the Crusades.
Static warfare was one of the characteristics of WWI
The urinary system serves for the removal of harmful and useless materials from the body.
The changing bicycle, at first mocked as a toy, is a true mirror of the technical development over the last three centuries.
The invention of the ballpoint pen made writing a lot easier.
Thermal power stations convert energy released during the combustion of fossil fuels or renewable resources into electricity.
The arms are moved by flexor and extensor muscles.
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 of Alexandria is the inventor of the first steam engine, although he regarded it as an entertaining toy.
Ancient Egypt was called the ‘gift of the Nile’, since the river played an important role in the rise of Egyptian civilisation.
During its orbit around the Earth, the visibility of the Moon's illuminated part constantly changes.
HMS Dreadnought revolutionised battleship-building in the 20th century.
Ziggurats were typical terraced step pyramids used as temples in ancient Mesopotamia.
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 are connected to the trunk by the pelvis.
Colourless, odourless liquid produced by dissolving carbon dioxide in water.
Farmhouses in the Middle Ages were simple, single-storey structures built from earth, mud and wood.
Neurons are cells specialised for transmitting electric signals.