As
an AI language model, I don't quite understand the concept of "cold knowledge" in this context, but I assume that you're looking for some little-known, interesting facts that most people haven't heard of before. So, let me present to you ten such facts in no particular order, along with their explanations:
1. The acceleration due to gravity at the center of the Earth is zero. Gravity is what keeps our feet on the ground and makes objects fall when we drop them. However, the force of gravity is not the same everywhere on the Earth. At the center of the Earth, where all the mass is concentrated, the gravity is pulling you in all directions equally, canceling out the net force, and making you weightless.
2. Humans can smell fear. Research has shown that when we feel fear or anxiety, we emit chemicals called pheromones, which can be detected by other animals, including humans, through their olfactory system. In fact, experiments have found that people can distinguish between sweat produced by fear and that produced by physical exertion!
3. The shortest war in human history lasted only 38 minutes. In 1896, the Sultan of Zanzibar declared war on the British Empire. The British responded by bombarding the Sultan's palace with their naval guns, which set it on fire and forced him to surrender just 38 minutes later. The casualties on both sides were minimal, making it the shortest recorded war in history.
4. Elephants can communicate with each other using infrasound. Elephants are known to produce low-frequency vocalizations that are below the range of human hearing (infrasound), which can travel long distances through the air and the ground. Some researchers believe that these sounds may allow elephants to communicate with each other over large distances and detect seismic activity.
5. The world's quietest room is so quiet, you can hear your own heartbeat. In Minnesota, there's a soundproof room called the "anechoic chamber," which is designed to absorb all sound waves, making it the quietest place on Earth. The room is so quiet that you can hear your own blood flow and your internal organs work, and it can induce hallucinations and disorientation in some people.
6. The longest English word is 189,819 letters long. The word is "Methionylthreonylthreonylglutaminylarginyl...isoleucine," which is the chemical name for a protein in the human body. It would take over three years to pronounce the word at a rate of one letter per second!
7. There are more possible ways to shuffle a deck of cards than there are atoms on Earth. A deck of 52 playing cards can be shuffled in 52! (52 factorial) different ways, which is approximately
8.0658 x 10^6
7. That's more than the estimated number of atoms in the observable universe, which is about 10^80!
8. Honey never spoils. Honey is the only food that doesn't spoil, thanks to its unique chemical composition and low moisture content. Archaeologists have even found jars of honey that are thousands of years old and still edible!
9. The shortest complete sentence in English is "I am." In English, a sentence needs to have a subject and a verb to be considered complete. "I am" is the shortest sentence that satisfies this requirement, and it's also a profound philosophical statement!
10 The world's quietest place is underwater. The Marianas Trench, the deepest part of the ocean, is so remote and quiet that sound waves can travel extraordinary distances without being absorbed or distorted by the surrounding water. Some researchers believe that the areas around the trench may be the quietest places on Earth, even quieter than the anechoic chamber. In conclusion, these are just a few of the many fascinating and sometimes bizarre facts that make the world a wonderful and mysterious place. It's always good to remember that there's always something new to learn and discover, no matter how well we think we know the world.