Stearic acid (octadecanoic acid) (C₁₇H₃₅COOH)

Solid, white substance, a constituent of vegetable oils and animal fats.

Cellulose (C₆H₁₀O₅)n

The building material of the cell walls and fibres of plants.

Fullerene (C₆₀)

A crystalline allotrope of carbon which was discovered at the end of the 1980s.

Nitric acid (HNO₃)

One of the oxoacids of nitrogen. A colourless compound with a pungent odour, a strong oxidant.

Enzymes

Enzymes are protein molecules catalysing biochemical reactions. Their activity can be regulated.

Carbonic acid (H₂CO₃)

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

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.

Muscles of the upper arm

The arms are moved by flexor and extensor muscles.

Bones of the lower limbs

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

The urinary system

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

Haemoglobin

Oxygen carrier protein in our red blood cells.

Neurons, nervous tissue

Neurons are cells specialised for transmitting electric signals.

How does it work? – Escalator

This animation demonstrates how an escalator works.

Aurora cruiser ship (1900)

The name of the Russian armoured cruiser became well known during the October Revolution of 1917.

Pearls

Pearls, often used as gemstones, are the by-products of certain molluscs' protective mechanisms.

Vertebrate brain evolution

During the evolution of vertebrates the relative development of brain areas has changed.

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.

Limbic system

The limbic system plays an important role in forming emotions and in learning.

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