It is said that the pyramids that exist in Egypt were built around 2500 BC, but how did you carry and stack 3 million stones, each weighing about 2 tons? There are still many mysteries. Meanwhile, ...

The volume of a 3D shape is the amount of space inside it. Volume is measured in cubic units such as cm³ and m³. The volume, or capacity, of liquids is measured in millilitres or litres. The surface ...