We often use markers in our daily life, especially at school. But there is one big problem – markers aren’t refillable. After markers run out of ink, they are usually thrown away without thinking twice. For most makers the reservoir,…

On December 8th, 1921, Fred R. Barnard used the slogan “One Look is Worth A Thousand Words” to promote advertisements on streetcars. This slogan has not lost its relevance to this day: Certain things can be expressed more precisely using…

Greenhouse gases need to be cut at every turn, but neither at the political and societal level nor in one’s own habits you can change everything at the same time. So where do we start? Perhaps where it will do…

Everyone loves ice cream! But have you ever looked at an ice cream cone through the eyes of mathematics? In this task, we are trying to optimise the ice cream cone! Think about what an ice cream cone is mathematically….

An ancient Greek mathematician, geographer, and astronomer named Eratosthenes of Cyrene was the first person to determine the size of the Earth using the principles of geometry and astronomy. Around 240 B.C., he achieved this remarkable feat by designing an…

We’ve all heard the phrase: “The next wars will be over water”. Water scarcity is recognized as one of the most important global risks that humanity will face in the coming years (see www.un.org/en/climatechange/science/climate-issues/water). In the island complex of Cyclades…

There are so many options of various types of vehicles on the market that it is often hard to know what to choose. Here is a task to help you analyse options and find the type of car that fits…

Your birthday is a very special day of the year. Hopefully the weather will be fine so you can do special things: throw snowballs, have a garden-party in the sun, enjoy the colored leaves on a forest hike or fly…

CO₂, climate crisis – everyone knows by now that we have a problem. To deal with it properly, we also need to understand the math behind it. The greenhouse gases that make our earth warmer stay in the atmosphere for…

The question of which sofa you can just push through a hallway that turns at right angles is an unsolved mathematical problem. Fame and glory await the designer of the ideal sofa! Imagine you have a hallway that turns at…

In a film documentary about the Eiffel Tower, we learned the following information: The elevators in the Eiffel Tower travel as many kilometres in a year as if they circled the entire globe two and a half times. How could…

Waste production is a global problem. Worldwide, people are looking for solutions for this. Waste is produced in various locations. How much do waste do we produce at home? The Eurpoean Union tries to reduce our waste production. For instance,…