A Fact is a thing that is indisputably the case and is typically proven through evidence. If science, logic, and citation can prove something is true, then it gets labeled fact. If one or more parts of a statement are false, then it should be categorized a myth (all half-truths are myths). Some truth has grey areas, others like “Lincoln was a Republican” are a matter of record. You’ll find both types below, and when we use philosophical arguments that employ logic and reason, it will be noted.

Below is a list of factoids we have rated as “facts”. If you think you can prove any of the facts below to not be true, please let us know in the comments. All input will be considered. See our list of myths hereLearn more about what is a fact?


All Cells In a Human Start as One Cell Fact

All the cells in a human body start as one cell, a fertilized egg containing 1/2 the mothers DNA and 1/2 the fathers. That cell divides many times creating a unique human being.

Humans Have Many Different Types of Cells Fact

The human body has about 37 trillion cells, comprising 200 different types. Each cell has structures responsible for making hundreds of thousands of different proteins from 20 types of amino acids.

You Can Catch up on Sleep Fact

Studies show you can semi-effectively catch up on short-term sleep debt over a few nights, but not long-term sleep debt accumulated over time.

We Know How Complex Cells Evolved Fact

Complex cells (eukaryotes) likely evolved from single-celled organisms (prokaryotes) absorbing other prokaryotes, becoming single complex cells over time (endosymbiosis).