Bridge expansion joint

The difference between winter and summer temperatures can cause bridges to contract or expand as much as 20 cm, which is called thermal expansion. To solve...

Inhaling Helium

What do you think happens if we inhale Helium?

Breaking glasses

Entropy is present in all processes of life, from physics to chemistry, from architecture to biology.

Stars of the four seasons

As seasons change, we see different constellations in the night sky. The North Star is easy to identify in a picture taken with long exposure time, as it...

3D graph tutorial

Let's find out how to use the 3D graph tool.


Have you ever heard about boomwhackers? Believe it or not, these are real musical instruments.


Let’s make a pinwheel! It is a witty little toy if you give it a go in windy weather, too!

The distribution of food on Earth

Much more food is produced on Earth than is required to feed the population. While most people in developed countries have access to enough food, people in...

The Bohr model

Among the most significant research carried out in the early 20th century focused on the structure of the atom.

Test tutorial 2.

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

Seconds pendulum

How can this pendulum accurately measure time in seconds?

Homemade firefighting foam

We can produce carbon dioxide gas using sodium hydrogen carbonate and acetic acid. The carbon dioxide puts out the flame.

Do walnuts burn?

The energy released by the burning walnut is used to heat water.

Giant rivers at the Equator

The largest rivers on Earth are found in the tropical zone.

The green-winged macaw

A brightly coloured and extremely loud parrot whose screams can be as loud as 110 dB. In humans, long-term exposure to sounds of such intensity can cause...

What are lichens made of?

A combination of fungal hyphae and algal cells viewed under a light microscope at a hundred times magnification.

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