You Are Made of Stardust – The elements that make up the human body were formed in the cores of ancient stars, meaning we’re literally made of star material.
Water Can Boil and Freeze at the Same Time – In a process called the "triple point," water can exist in all three states—solid, liquid, and gas—under specific temperature and pressure conditions.
Bananas Are Radioactive – Due to their high potassium content, bananas emit low levels of radiation, but don’t worry—it's perfectly safe to eat them.
The Sun Is White, Not Yellow – While it appears yellow from Earth due to our atmosphere scattering shorter wavelengths, the Sun’s actual color is white.
Octopuses Have Three Hearts – Two pump blood to the gills, and one pumps it to the rest of the body. They also have blue blood due to copper-based hemocyanin.
You Can Fit All of Humanity in a Sugar Cube – The atoms in our bodies are 99.9% empty space. If you removed all the space, the entire human race could fit into the size of a sugar cube.
Your Body Glows in the Dark – Humans emit a small amount of light that’s invisible to the naked eye, known as bioluminescence, which peaks in the late afternoon.
A Day on Venus Is Longer Than a Year – Venus takes longer to rotate on its axis (243 Earth days) than it does to orbit the Sun (225 Earth days), making a day longer than its year.