Yes, really. A cool thing called total internal reflection is applied when pointing a laser beam through a container of water. When light travels through water, it’s slowed by the heavier particles in water,as described here. Thus, the laser beam effectively gets “trapped” in the water.

A Laser Can Get Trapped In Water

Your childhood dreams of floating on a weightless cloud may get rained on with this fact: the average cumulus cloud can weigh up to a million pounds. A million pounds! That’s about as heavy as the world’s largest passenger jet.

A cloud can weigh over a million pounds

This fact seems counterintuitive, but it’s called the Mpemba effect, after a Tanzanian student named Erasto Mpemba who told his teacher than a hot mixture of ice cream froze faster than a cold one. Scientists now believe this is because the velocities of water particles have a specific disposition while they’re hot that allows them to freeze more readily. If proven correct, this finding could also have implications in daily life, like cooling down electronic devices.

Hot Water Freezes Faster Than Cold Water

About 96 percent of the universe is made up of dark matter and dark energy, which are undetectable to humans. Scientists believe this is because the particles that make up these substances don’t interact with regular matter or light. Even though scientific discoveries are constantly being made about the stars, planets, and other galaxies we can see, it’s impossible to make conclusions about things that are invisible to our eyes.

We have no idea what most of the universe looks like

On the rare occasion that you swallow a razor blade, don’t fret. The human body is more capable than you think. Acids are ranked on a scale from 0 to 14—the lower the pH level, the stronger the acid. Human stomach acid is typically 1.0 to 2.0, meaning that it has an impeccably strong pH. In a study, scientists found that the “thickened back of a single-edged blade” dissolved after two hours of immersion in stomach acid.

The human stomach can dissolve razor blades

The letters J and Q don’t appear anywhere on the periodic table. Go ahead and double check. We’ll wait.

Only Two Letters Don't Appear In The Periodic Table

For one of our strangest science facts, bananas contain potassium, and since potassium decays, that makes them slightly radioactive. But this is one of those fun science facts you don’t need to worry about. You’d need to eat 10,000,000 bananas at once to die of radiation poisoning, Forbes reports.

Bananas Are Radioactive

In just one teaspoon of soil, there are more microorganisms than people on the planet, said the U.S. Department of Agriculture. “Millions of species and billions of organisms—bacteria, algae, microscopic insects, earthworms, beetles, ants, mites, fungi and more—represent the greatest concentration of biomass anywhere on the planet.”

Soil is alive and well

If you spin a ball when you drop it, it will fly through the air as it falls. This is called the Magnus effect, and it makes playing tennis and soccer a whole lot easier.

You Can Make Balls Fly

The genes responsible for the most common type of colourblindness are found on the X chromosome, the National Eye Institute explains. Even if women have the genes on one of their two X chromosomes, a properly functioning gene on the other one makes up for that loss. If men inherit the gene on their only X chromosome, they’ll become colourblind.

Men are more likely to be colourblind than women

These strange but fun science facts prove the world really is a marvelous place. Find out what your teachers forgot to mention in class.