Facts

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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 here. Learn more about what is a fact?

Horseshoe crab blood is valuable for its use in medicine.

Horseshoe Crab Blood is Valuable fact

Horseshoe crab blood is highly valued, especially in the biomedical field. Its blue blood is essential in ensuring safe and sterile vaccines and medical equipment.
There's a Mathematical Constant Called "e" That's as Important as Pi

“e” is Just as Important as Pi fact

We all have heard of the famous mathematical constant Pi, but did you know there is another constant that is just as important called "e"?
jellyfish are immortal

Some Jellyfish are Immortal fact

It is true that Turritopsis dohrnii, known as the "immortal jellyfish," can avoid death from old age through a unique process called transdifferentiation.
Mona Lisa painted with eggs

Leonardo da Vinci painted the Mona Lisa with eggs fact

A study published in Nature Communications suggests that "Old Masters" such as Leonardo da Vinci, Sandro Botticelli, and Rembrandt might have used proteins, particularly egg yolk, in their oil paintings.
cows have best friends

Cows Have Best Friends fact

The claim that cows have best friends is rooted in scientific research. Studies have shown that cows are social creatures, forming strong bonds with specific individuals in their herd.
the Eiffel Tower grows bigger in the summertime

The Eiffel Tower Gets Taller in the Summertime fact

While the claim that the Eiffel Tower grows 6 inches taller during the summer is an exaggeration, the tower expands in warmer weather. This phenomenon highlights the fascinating science behind how metal structures can expand and contract due to temperature changes.