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This Reader’s Digest article details amazing science facts!
The human stomach can dissolve razor blades
Talk about a bizarre feature of the human body: If you happened to swallow a razor blade, your stomach acid would dissolve it. Acids are ranked on a scale from zero to 14—the lower the pH level, the stronger the acid. Human stomach acid typically has a pH of 1 to 2, which is incredibly strong. In a study published in the journal Gastrointestinal Endoscopy, scientists discovered that the “thickened back of a single-edged blade” dissolved after two hours of immersion in stomach acid. That said, we wouldn’t recommend swallowing one. Dissolvable or not, razor blades are still dangerously sharp.
A laser can get trapped in water
A cool thing known as “total internal reflection” happens when you point a laser beam at a jet of flowing water. To demonstrate this phenomenon, scientists from Harvard University positioned a laser on one side of a clear tank of water. On the other side, the water flowed through a hole and into a bucket. The heavier particles in the water slowed the laser’s light, effectively “trapping” the laser beam in the water. That’s why, when the light hit the flowing stream, it looked like a red waterfall. Even as the water flow was gradually decreased, the laser beam remained contained inside the jet until it eventually disappeared when the water was turned off completely.
Earth’s oxygen is produced by the ocean
Have you ever stopped to think about where oxygen comes from? Your first thought may be of a rainforest, but here’s a cool science fact for you: We can thank plant-based marine organisms for about half of the Earth’s fresh air, according to the National Oceanic Service. Luckily, this isn’t one of those ocean mysteries we’ll never solve. Scientists have learned that plankton, seaweed and other photo synthesizers produce more than half of the world’s oxygen.
Ocean animals use Earth’s magnetic field for orientation

Lost land animals aren’t the only ones who can find their way home; it turns out, some sea animals can too. But sea creatures use a completely different means of navigation. Here’s one of the coolest animal facts you’ll ever learn: According to the U.S. Geological Survey (USGS), some animals, like sea turtles and salmon, have the ability to sense the Earth’s magnetic field and can use this sense like a compass for navigation.
A cloud can weigh around a million pounds
Your childhood dreams of floating on a weightless cloud may not withstand this science fact: The average cumulus cloud can weigh up to a million pounds, according to the USGS. That’s even heavier than a Boeing 747 jet completely full of cargo and passengers. So why do they float? The moist air in clouds weighs less than the dry air below.
Soil is full of life
There are more microorganisms in a single teaspoon of soil than there are people on the planet. “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,” says the U.S. Department of Agriculture.
Rats laugh when they’re tickled
These creatures are more dynamic than we think. Rats have the ability to “laugh” when tickled. A video from National Geographic based on a 2023 German study demonstrates that rats respond positively to tickling, and they even chase after the researcher’s hand in a playful manner.
Bananas are radioactive

Here’s a very strange history-of-food fact: Bananas contain potassium, and since potassium decays, that makes the yellow fruit slightly radioactive. But don’t worry—you’d need to eat a billion bananas (literally) in one sitting to die of banana-induced radiation poisoning, according to Joe Schwarcz, PhD, director of McGill University’s Office for Science and Society.
Hot water freezes faster than cold water
This may seem counterintuitive, but it’s called the Mpemba effect, after a Tanzanian teenager in the 1960s who found that homemade ice cream froze faster when it went into the freezer right after the mixture was boiled, and therefore still hot, instead of cooled down. Ever since, scientists have been trying to find an explanation for this phenomenon. Recent work has suggested it’s the result of the hot water being out of thermodynamic equilibrium. (That long science term refers to a system that’s stable and not undergoing changes to properties like temperature.) Other theories as to why this happens include the fact that cold water produces frost when freezing, which ironically insulates the water underneath, while hot water doesn’t.
There are more trees on Earth than stars in our galaxy
Here’s a cool space fact we bet you didn’t know: NASA experts believe there could be anywhere from 100 billion to 400 billion stars in the Milky Way. However, a 2015 paper published in the journal Nature estimated that the number of trees around the world is much higher: 3.04 trillion.
Humans have genes from other species
We like to think of humans as being superior to other living creatures, but the reality is that our genome consists of as many as 145 genes that have jumped from bacteria, fungi, other single-celled organisms and viruses, according to a study published in the journal Genome Biology. This process, called “horizontal gene transfer,” could change how we think about evolution.
But don’t worry—humans have a lot of DNA

Scientists have mapped the human genome and now know there are more than 3 billion base pairs of DNA in human genes and more than 25,000 genes in the human genome, according to an article in Nature. An entire copy of that genome exists in each of the 28 to 36 trillion cells in the adult human body.
SOURCE: READERSDIGEST.COM Elizabeth Yuko
























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