Fun fact 1: Chocolate is deadly to dogs. Just a few ounces can kill a puppy due to damage to its heart and nervous system.

2. Bruce Lee's movements were so fast that they were almost invisible, so the film had to be shot at a slower speed.

3. Quicksand is usually not deep, unlike in the movies, so there's no need to worry. Unless your face is buried in quicksand, you'll be fine.

4. Mosquito repellent does not repel mosquitoes but interferes with their sensory organs, making it impossible for them to locate people.

5. The thumb's nail grows the slowest, while the middle finger's nail grows the fastest.

6. If the oil-based pen dries out, apply nail polish, put the cap back on, and it will be usable again after a while.

7. If you accidentally get foundation on your clothes, just wipe it off with toner and it will disappear immediately.

8. Wearing earplugs for an hour can increase the number of bacteria in your ears by 700 times.

9. Do fish get thirsty? 

It turns out that fish do get thirsty, but they drink water in a different way than humans. The Alfred Wegner Institute in Bremen, Germany, points out that because there are two types of fish, saltwater and freshwater, and each type drinks water differently, saltwater fish obtain water by swallowing, while freshwater fish obtain water through food and their gills. 

10. Is sign language used worldwide? 

Chinese people speak Mandarin, and British people speak English. Is there a difference between Chinese and British sign language? Can a deaf Chinese person communicate with a deaf British person using Chinese sign language? A professor from the Sign Language Department of the University of Hamburg in Germany stated that sign language has existed for as long as deaf people have existed on Earth. Sign language has developed from generation to generation, and like all natural languages, it varies according to geographical distribution, just as there is no single, universally understood spoken language. For example, in Germany, the sign language for "red" involves repeatedly touching the lower lip, which differs from the internationally accepted expression.

11. If six billion people on Earth shouted at the same time, would the sound reach the moon? 

The Earth's population is approximately 6.655 billion. If everyone in the world gathered on the Australian plains and shouted at the moon, would Chang'e (the Moon Goddess) hear them? If everyone shouted at the same time, the enormous sound would shake the Earth, potentially rupture everyone's eardrums, and some might even die from the noise. However, no matter how loudly everyone shouted, the sound wouldn't reach the moon, even with a high-performance microphone. This is because there is no atmosphere between the Earth and the moon, and sound must travel through gaseous or liquid substances; it cannot travel in a vacuum. The sound would only reach the interior of the atmosphere, at most a height of 700 meters! 

12. In the event of a traffic accident, when jumping out of a moving vehicle to escape, is it safer to jump forward or backward?

In such an emergency, a matter of life and death, you absolutely cannot make the wrong decision. If you decide to jump in the direction the car is traveling, you will certainly die. This is because your body, once separated from the car, will follow the "law of inertia," accelerating forward with the car's speed before crashing heavily to the ground. If you jump backward, the speed will be relatively offset, reducing the impact force upon landing. Furthermore, if you jump forward, your body will lean backward upon landing, increasing the risk of a head injury and thus the mortality rate.

13. Which type of water, cold water or hot water, is more effective for extinguishing fires? 

If a fire breaks out, is it better to use cold water or hot water to put it out? Needless to say, a fire is very hot, and using cold water can lower its temperature. However, if you want to extinguish the fire as quickly as possible, it's best to use hot water. Compared to cold water, hot water can generate steam more quickly, covering the fire source. Without oxygen, the fire will stop burning. But in a real fire scene, where would you find hot water?

14. Why does it take longer to urinate when you've been drinking?

When drunk, urination takes longer. Many people believe that alcohol has a diuretic effect, but this is incorrect. Alcohol dulls our sense of bladder function. Normally, we feel the urge to urinate when our bladder reaches 200cc, but when drunk, the bladder reaches its maximum capacity and we don't feel the urge to urinate. An adult's bladder capacity is about 400-500cc, so when drunk, the amount of urine is definitely twice the normal amount, thus prolonging the time spent urinating.

15. Why does Colonel Sanders always wear white clothes? 

Colonel Sanders' image is modeled after the founder of KFC, Colonel Sanders. Why doesn't Sanders change his clothes all year round? Did he not have money to buy clothes? Colonel Sanders was a very influential person. One day, a TV station asked him to be a guest on their show. It happened to be winter, and because Colonel Sanders hadn't ironed his winter suit, he had to wear his summer white suit. The audience thought that Sanders always wore such thin clothes in the freezing cold, and thought he looked very stylish, so he became very popular. From then on, the white suit became Colonel Sanders' trademark!

16. Why doesn't the heart get cancer? 

Cancer can occur in the stomach, liver, large intestine, and testicles, but why don't we hear about heart cancer? The reason is that cells outside the heart have the ability to proliferate. Even if injured, they can heal over time because cell proliferation allows the wound to heal. However, heart cells do not proliferate. Cancer cells continue to proliferate and then destroy surrounding tissues, precisely because heart cells do not proliferate, thus preventing cancer cells from invading the heart. 

17. Where does nasal discharge actually accumulate? 

Whenever I catch a cold or have nasal allergies, my nose keeps running. Where does all that nasal mucus accumulate in my body? Actually, nasal mucus doesn't accumulate inside the body. Normally, the nasal glands and cells regularly supply water to the mucous membrane on the surface of the nostrils. But when I catch a cold, immune blood cells and chemicals mix with the water to wash out foreign objects and bacteria that have entered the nostrils. The nasal glands and cells also continue to secrete water, so even if we keep blowing our noses, nasal mucus will keep flowing out. 

18. What exactly are blisters after a burn? 

After a burn, blisters will inevitably appear, and when they break, fluid will leak out. Why does fluid appear on the skin for no apparent reason? Burns occur because high heat causes inflammation of the skin and cells. Cells are damaged, and bodily fluids seep into the skin. The outer layer of the skin is covered by the epidermis, and beneath the epidermis is the dermis. When bodily fluids remain between the epidermis and the dermis, blisters form. The fluid in the blisters is, more accurately, bodily fluids released after cell damage, including blood plasma, lymph, tissue, and a mixture of proteins, fats, inorganic salts, amino acids, and other components.

19. Your keyboard actually has more bacteria than the toilet.

20. Eating more animal offal before drinking can alleviate the effects of alcohol intoxication.

21. A normal person's eye muscles move an average of 10,000 to 15,000 times a day.

22. Dentists recommend that toothbrushes be placed at least 6 feet away from the bathroom to avoid the various particles generated and floating in the air when flushing the toilet.

23. The first product to be labeled with a barcode was Wrigley's chewing gum.

24. Michael Jordan earns more from Nike each year than all the workers in Nike factories in Malaysia earn in total.

25. Marilyn Monroe had six toes on one foot.

26. Hitler's mother considered abortion, but was dissuaded by her doctor.

27. A person will shed 40 pounds of skin in their lifetime.

28. If you are accidentally bitten by a crocodile, poke its eyeball hard, and it will let you go.

29. On average, it only takes 7 minutes for a person to fall asleep.

30. Yo-yos have been used as weapons in the Philippines.

31. Cats are the only domesticated animals not mentioned in the Bible.

32. Rubber bands are better preserved when refrigerated.

33.56% of keyboard input is done with the left hand.

34. "dreamt" is the only English word that ends with "mt".

35. Even without a head, a cockroach can survive for 10 days.

36. Unable to keep eyes open when sneezing.

37. Mexico City sinks 10 inches every year.

38. The brain is more active when sleeping than when watching TV.

39.80% of Americans like blue the most.

40. There are more chickens than people on this planet.

42. In Washington, D.C., there are more telephones than people.

The combined assets of 43.48 of the poorest countries are less than those of the world’s three richest families.

44. The first CEO of Marlboro Tobacco Company died of lung cancer.

45. Intelligent people have more zinc and copper in their hair.

46. ​​The world's youngest parents were a Chinese couple in 1910, with their children aged 8 and 9 respectively.

47. Our eyes were the same size when we were born, but our noses and ears keep growing.

48. You burn more calories while sleeping than while watching TV.

49. A person will die if they don't sleep for about 10 days.

50. Chewing gum while cutting onions will prevent you from crying.

51. Mona Lisa has no eyebrows.

52. If the moon is directly overhead, you will lose a little weight.

53. Alexander Graham Bell, who invented the telephone, never called his mother or wife because they were both deaf.

54. "I am." is the shortest complete sentence in English.

55. Just like fingerprints, everyone's tongue print is different.

56. "Bookkeeper" is the only English word that repeats three consecutive letters.

57. Right-handed people live an average of 9 years longer than left-handed people.

58. "The quick brown fox jumps over the lazy dog" uses every letter of the English alphabet.

59. If all Chinese people lined up and walked past you, the line would never end due to the excessively high birth rate.

60. More people in China use English than in the United States.

61. Every square inch of human skin contains 20 feet of blood vessels.

62. People use the restroom an average of 6 times a day.

63. A baby is born with 300 bones, but an adult has only 206.

64. Beards are the fastest-growing type of human hair. If a man never grooms himself, he will grow a 30-foot-long beard in his lifetime.

65. Which came first, the chicken or the egg? According to Genesis 1:20-22 in the Bible, the chicken came first.

66. The longest place name still in use is: Taumatawhakatangihangaoauauotameteaturi-

Pukakpikimaungahoronukupokaiwhenuakitanatahu, that is a hill in New Zealand.

67. If you take a flight from Tokyo at 7 a.m., you will arrive in Honolulu at 4:30 p.m. yesterday.

68. Scientists at the Parquet Observatory in Australia once thought they had received radio waves from extraterrestrial civilizations, but after investigation, they discovered that the radio waves actually came from a microwave oven in the observatory.

69. A single French kiss can exchange over 40,000 parasites and 250 types of bacteria.

70. Men have better eyesight than women, while women have better hearing than men.

71. Coca-Cola was originally green.

72. The most common name in the world is: Muhammad.

73. If "north" and "south" are not included, the seven states in English all have the same first and last letter.

74. On average, each American has two credit cards.

75. "Typewriter" is the longest English word that can be typed using a single row of keys on a QWERTY keyboard.

76. Women are twice as likely as men to be blind.

77. A person will not die from holding their breath.

78. When you sneeze, your heart stops beating for about 1 millisecond.

79. Pigs cannot see the sky.

80. "Sixth sick sheik's sixth sheep's sick" is one of the most tongue-twisting tongue twisters in English.

81. An excessively violent sneeze can fracture ribs, while trying to suppress a sneeze can cause blood vessels in the neck or brain to rupture, which can be fatal.

82. In a deck of cards, each suit's King represents a great historical monarch: Spades is King David, Clubs is Alexander the Great, Hearts is Charlemagne, and Diamonds is Julius Caesar.

83.111,111,111 x 111,111,111 = 12,345,678,987,654,321。

84. When you see a statue of a knight, if the horse is off the ground, then the knight died in battle.

85. As above, if one of the horse's front legs is raised, then the person has died from serious injuries sustained in battle.

86. As above, if all four hooves of the horse are on the ground, then the person dies of natural causes.

87. Honey will not spoil.

88. Crocodiles cannot stick out their tongues.

89. A snail can sleep for up to 3 years.

90. All polar bears are left-handed.

91. In 1987, American Airlines saved $40,000 by removing one olive from every salad served to first-class passengers.

92. Butterflies have their taste organs on their feet.

93. An elephant cannot jump.

94. No new animals have been domesticated in the past 4,000 years.

95. Generally speaking, people fear spiders more than death.

96. The words “assassination” and “bump” were coined by Shakespeare.

97. The background music for the stretching, chest expansion, and cool-down exercises in "Colorful Sunshine" is "The Song of Sunshine Sports."

98. Don't put a light bulb in your mouth, or you won't be able to get it out.

99. A baby's first poop is green.

100. A mobile phone can send text messages to itself. (A collection of little-known facts)

101. A street sign in Forest Hills, Queens, New York, has been hanging upside down and has not been straightened yet.

102. No one can understand Leonardo da Vinci's writing.

103. If your pet python stops eating and no longer coils up to sleep, but instead lies upright next to you, get rid of it quickly! It's using its body to gauge whether it can swallow you whole.

104. Chopin would cry whenever he heard the sound of a piano when he was a child.

105. American math enthusiast Clifford Adams spent 52 years finding the hexagonal magic square.

106. Huarong Road is a game that was renamed from the foreign game "Red Mane Horse".

107. It is said that cat urine glows in the dark.

108. The strongest and most powerful muscle in the human body is actually the tongue.

109. 30% of the advertisements seeking lovers are posted by married individuals.

110. A pig's orgasm can last for more than 30 minutes. – If even a pig can, then…

111. Actually, hippos run faster than humans.

112. The wingspan of a Boeing 747 is exactly the distance of the Wright brothers' first flight.

113. The inventor of the parachute gave the opportunity to be the first to ride a parachute to a dog.

114. Indonesian stick insects are the largest insects in the world, with some reaching a foot in length.

115. A 70-pound octopus can squeeze through a hole the size of a silver coin because they have no spine.

116. Tiger shark embryos undergo a fierce battle in their mother's womb; the victor is the baby tiger shark that survives and is born alive.

117. Roses picked in the afternoon last longer than those picked in the morning.

118. Elephants often remain standing after death (a common-sense fact).

119. Some insects can live for another year even without a head.

120. Cats can produce more than 100 sounds, while dogs can only produce 10.

121. Cats urinate more frequently in darker environments.

122. If a coin is tossed 1000 times, it will land heads up 495 times, not 500 times, because the coin is heavier.

123. The human stomach renews its secretions every two weeks; otherwise, it will digest itself.

124. Coca-Cola was originally green.

125. Hawaiian script has only 12 letters.

126. The province with the highest percentage of people walking to work is Alaska.

127. If Barbie were human, her measurements would be 39-23-33.

128. An average of 61,000 people are in the air every hour in the United States.

129. There is only one food that never spoils: honey.

130. There is a type of oyster near the Caribbean Sea that climbs on oyster beds.

131. A person's nose and ears continue to grow throughout their life.

132. In Japan, there is a type of watermelon that is square, designed for easy storage.

133. Starfish have 8 eyes, one on each leg.

134. Some insects have hairy eyes.

135. A giraffe's tongue is 2 feet long.

136. Elephants can stand upright on their heads.

137. Ants scratch themselves when they wake up in the morning.

138. The great inventor Thomas Edison was afraid of the dark.

139. The world's oldest goldfish is 41 years old and his name is Fred.

140. When Einstein was nine years old, he could not speak fluently, and his mother once thought he was mentally challenged.

141. An Arab woman can file for divorce because her husband doesn't make her coffee.

142. Only 55% of Americans know that the sun is a celestial body.

143. Most lipsticks contain fish scales (a little life tip).

144. Giraffes cannot cough.

145. Owls are the only birds that can distinguish blue.

146. A whale's heart beats only nine times per minute.

147. The water we've been drinking is 300 million years old.

148. Only 30% of people can enlarge or shrink their nostrils.

149. An oyster can change its sex from male to female, and then change it several more times during its lifetime.

150. According to a law passed by Britain in 1845, suicide was a very serious crime, punishable by hanging.

151. Astronauts cannot cry in space because there is no gravity, and tears cannot flow.

152. A chameleon's tongue is twice the length of its body.

153. Americans are the most frequent users of toothpicks.

155. It took Leonardo da Vinci 10 years to paint the lips of the Mona Lisa.

156. Why are the "East, South, West, North" in Mahjong opposite to the actual directions? 

When playing mahjong, players sit on four legs in a counter-clockwise direction according to the cardinal directions (East, South, West, North), which is completely opposite to the actual cardinal directions. Why is that? Actually, the cardinal directions only represent the numbers one, two, three, and four and have nothing to do with direction. In addition, most Chinese people use their right hand to hold the tiles, so changing the cardinal directions to counter-clockwise is purely for convenience, and there is nothing to study about it! 

157. If two people carry something up and down the stairs, which one will have an easier time? 

Everyone might assume that the person on top has the harder job, carrying the load while the person behind simply supports it, making it much easier. But according to gravity, wouldn't the weight of the luggage fall entirely on the latter? So what's the answer? From a mechanical perspective, if the luggage is positioned directly between two people, even on an inclined surface like a staircase, the weight is still evenly distributed. Neither side is inherently more relaxed or more tired; the feeling of heaviness or lightness is purely psychological! 

158. Where does nasal discharge actually accumulate? 

Whenever I catch a cold or have nasal allergies, my nose keeps running. Where does all that nasal mucus accumulate in my body? Actually, nasal mucus doesn't accumulate inside the body. Normally, the nasal glands and cells regularly supply water to the mucous membrane on the surface of the nostrils. But when I catch a cold, immune blood cells and chemicals mix with the water to wash out foreign objects and bacteria that have entered the nostrils. The nasal glands and cells also continue to secrete water, so even if we keep blowing our noses, nasal mucus will keep flowing out.