# Spaces and dimensions

What do mathematicians and physicists mean with phrases like higher and/or extra dimensions? Let’s travel through a Universe of spaces and dimensions! Continue reading Spaces and dimensions

# Complex numbers: an introduction

We will leave the domain of real numbers behind us and start exploring the plane of complex numbers. An introduction to a realm beyond imagination. Continue reading Complex numbers: an introduction

# Lab centrifuges and prime numbers

Lab centrifuges are crucial in e.g. coronavirus research. It’s vital the test tubes are balanced. There is an easy method to know if that’s possible. Continue reading Lab centrifuges and prime numbers

# The Collatz Conjecture

The Collatz Conjecture is probably one of the easiest to understand problems which hasnâ€™t yet been answered in the history of mathematics. Continue reading The Collatz Conjecture

# Mirror, mirror, what’s up with the mirror writing?

Ever wondered why sentences, words, and letters always exclusively seem to have their left and right reversed in the mirror, while they are almost never projected upside down? Probably, because mirrors do something else than you would expect. For starters, mirrors don’t reverse left and right. Continue reading Mirror, mirror, what’s up with the mirror writing?

# Just a minute: Minus minus and negative times negative

Minus minus is plus. And negative times negative is positive. Two negatives make a positive. You may have heard or uttered these expressions many times. Even though you will know this already, here you will find an algebraic proof, just for your reference. Requirements: simple algebra from the second year in secondary, high or grammar school. Continue reading Just a minute: Minus minus and negative times negative

# The riddle of birthdays

Probabilities can be hard to grasp. For instance, what are the chances that among a birthday party’s attendants two or more people will have their birthdays on the same day? Probably better than you might expect. Continue reading The riddle of birthdays