Author: Simon Gustafsson

A chemistry teacher has a lesson and first wants to find out the students’ prior knowledge of volume and weight measurements. He begins by explaining that in chemistry labs, students must be able to mix different liquids in exact proportions. He therefore asks if anyone can say how much a litre is. That’s as much […]

There are seven continents on Earth. That’s the short answer. However, not everyone agrees on this. In this article, we explain what exactly a continent is and why there is so much disagreement about the number of continents our world has. What is a continent? The word continent is used to distinguish between several large […]