11 interesting scientific facts that have not been learned in school

11 interesting scientific facts that have not been learned in school


1. Polar bear cannot be captured by infrared camera?

The polar bear's hair has a transparent and porous structure and is an excellent thermal insulation fiber. Not only that, their hair can reflect infrared radiation, making polar bears almost invisible in thermal imaging cameras.

In 2018, Xinhua reported an article that Zhejiang University researchers imitated the structure of polar bear hair to develop a "heat stealth" fabric, which was published in the "Advanced Materials" magazine

2. Sunflower can clean up radioactive waste

Scientists initially focused on plants absorbing radioactive materials, not to make them clean. Instead, it evaluates the food chain after plants absorb radioactive materials.

3. Fleas are faster than the space shuttle

The flea is faster than the space shuttle. Its jumping speed is about 7.97 cm per millisecond. Flea's speed is 50 times faster than the space shuttle's acceleration


4. Babies have 64 more bones than adults

Newborn babies have as many as 305 bones, and when they grow up, the number of bones becomes 206. Because in the process of growing up, these "more" bones slowly merged

5. Hiccups in space will vomit

Unlike in space, astronauts hiccups can easily beat air together with food and gastric juice. At this time, the gas and food in the stomach will come from the stomach to the mouth like thick bubbles, just like we usually vomit Same time






6. Scorpion glows under ultraviolet light

Scorpion is a poisonous small animal, because its skin is transparent under ultraviolet light. Any adult scorpion species will appear yellow-green or blue under ultraviolet light.


7. It is raining and raining on the earth, but it is diamonds on these planets.

The atmospheres of Uranus, Neptune, Saturn, and Jupiter all contain methane. Strong lightning can turn methane into carbon in the form of coal ash. Coal ash solidifies into graphite during the sedimentation process, and then turns into diamond under the action of high temperature and pressure , This is the origin of the diamond rain




8. The most serious contradiction in physics, hot water freezes faster than cold water (Mpamba phenomenon)

An article on "Top Ten Scientific Scams of the Twentieth Century" mentions that the Mpamba phenomenon is only the product of April Fools' Day. This is cited by many articles and papers. At first, many scholars did not believe in the Mpamba phenomenon. However, with the repeated verification of the Mpamba phenomenon, people began to understand and study the reasons.




In 2012, the Royal Society of Chemistry organized a competition to explain the Mpamba phenomenon. More than 22,000 people participated, and finally Erasto Mpemba himself announced Nikola Bregovivic as the winner. Bregović proposed two reasons for this effect-the colder samples were too cold rather than frozen, and the enhanced convection in the warmer samples accelerated cooling by maintaining a thermal gradient on the vessel wall. However, many researchers are still controversial about the above opinions.





9. Banana has slight radiation

There is a scientific term called "banana equivalent dose", which is the number of bananas eaten to measure the amount of radiation received. So the dose of taking a chest radiograph is equivalent to the radiation received by eating 200 bananas in one breath.


10. The length of DNA can be extended from the sun to Pluto and then returned 17 times




There are about 37 trillion cells in the human body. If you unwind the DNA of each cell and connect them one by one, then the total length is about 2 * 10 ^ 14 meters. This distance is the distance from the sun to Pluto ( 1.2 * 10 ^ 13 meters) 17 times.



11. A day on Venus equals 1 year




The day of Venus lasts longer than a year. This painful slow rotation makes a day on Venus last for 243 earth days. In contrast, its revolution period (orbiting the sun) only requires 225 Earth days.