The pupillary light reflex

In strong light the pupil contracts, while in low light it dilates.

The formation of the Andes

The Andes were formed by the collision of two tectonic plates, one oceanic and one continental.

Black snake forest

We also utilize the degradable nature of sodium bicarbonate in our everyday kitchen life: it is the basis for baking powder.

Test tutorial 4.

Let’s find out how to use the Test Editor tool.

Natural gas and petroleum

Natural gas and petroleum are among the most important sources of energy and raw materials today.

Modelling protein digestion in the stomach

Let’s simulate protein digestion in the stomach using a mixture of hydrochloric acid and pepsin.

Art Nouveau architecture

Art Nouveau did away with all the previous eclectic styles in architecture and paved the way for the modern architecture of the 20th century.

The history of lighting

Nowadays it is perfectly natural to turn on the lights. But it has not always been that way.

The subtropics

The subtropics are located between the tropical and temperate zones, between 23.5° and 40° latitude in both hemispheres.

Hand-powered paper turbine

Let’s rotate a paper wheel with the heat of our hands.

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