Unit Of Luminous Intensity (candela)
Mathematics / History
Originally, each country had its own, and rather poorly reproducible, unit of luminous intensity; it was necessary to wait until 1909 to see a beginning of unification on the international level, when continue reading this fact

Picture This
Mathematics / Geometry
What 3 dimensional shape will pass through a rectangle, triangle and circle each time filling the whole space? The answer may surprise you in it's simplicity. Before I tell you what it is, see if you continue reading this fact

Who Invented Zero?
Mathematics / History
Many concepts that we all take for granted sounded strange and foreign when first introduced. Take the number zero for instance. Any firstgrader can recognize and use zeros. They sound so logical and continue reading this fact
