Top 8 random facts about everything around us, seem familiar but 90% of people don't know

Throughout the history and development of society, there have been countless strange things, inventions and majestic natural wonders around us. Even when you think you are a knowledgeable person or a person with outstanding intelligence, knowledge is still an endless gap that can never be filled.

Surprising facts around us that not everyone knows

So, no matter what age we are, there will always be some facts that surprise us about this world. Although they may not promote our daily lives much, they will definitely make us feel surprised about the objects and events around us.

1. Unmade beds are better for our health

Being neat and clean will definitely make our living environment more airy and comfortable. However, making the bed seems to go against this standard.

Leaving sheets untidily on your mattress can kill around 1.5 million dust mites, making it better for your health than folding your bed sheets after you wake up, according to new research from Kingston University.

2. Men have longer tongues than women

The common misconception that women talk more than men is hard to prove. However, when it comes to tongue length, men are definitely ahead. A study conducted at the University of Edinburgh found that the average tongue length of adult women is 7.9 cm, while that of men is 8.5 cm.

3. The Eiffel Tower can be 15cm taller during the summer

One of the most famous landmarks in Europe is the Eiffel Tower. Besides its iconic status, the fact that this architectural wonder changes its height slightly with the seasons also surprises many people.

In the summer, when the temperature is above 40°C, the Eiffel Tower grows up to nearly 6 inches (about 15 cm) higher, and this is not difficult to explain because the metal materials expand when exposed to high temperatures, leading to an increase in the height of the tower. In addition, the heat can also cause the top of the tower to lean up to 17 cm in the summer.

4. YouTube started out as a dating app

When mentioning YouTube, people immediately imagine a globally famous video viewing application, a symbol of the strong development of social networking platforms. However, few people know that initially, it was not created with the current purpose.

According to founder Steve Chen, when YouTube launched on Valentine's Day, February 14, 2005, the original idea was to allow people to upload videos of themselves, where they would talk about their romantic interests and the type of partner they were looking for, like a "video profile" to find someone to date. Later, people shared everything about themselves and created the YouTube community that we know today.

5. Men with daughters live longer

According to one study, we can't be sure whether fathers with daughters are happier than fathers with sons, but having daughters may actually help fathers live longer.

A team of scientists found that the number of daughters had a positive effect on the life expectancy of their fathers. On average, each daughter added 74 weeks to their life expectancy. On the other hand, the number of sons had no noticeable effect on the life expectancy of the fathers.

6. Homework was once considered harmful to children's health.

Although homework is not a bad thing, it is a controversial issue. In the US, homework was banned in 1901 in California for students under 15 years old when some doctors and teachers argued that homework had a negative impact on children's health because it caused them too much stress.

However, assigning a moderate amount of homework was difficult to disprove, so homework was reinstated in 1917.

7. Lobster was once prison food.

As one of the expensive ingredients often used in high-class restaurants, few people know that lobster was once a dish for prisoners.

In the 1880s, lobsters were so abundant that they covered the beaches of the Massachusetts Bay Colony, USA. As a result, they were affordable and were called 'poor man's protein' and were the prison food of choice for their inmates.

8. The eraser was invented 200 years after the pencil.

Although pencils have been with us for over 400 years, it took a long time for the cute little eraser on the back of the pencil to appear, specifically about 200 years.

In the 18th century, before rubber was used as the main material for making erasers, people used sponges or even bread crumbs to cover up pencil marks or erase mistakes.

The use of rubber as an eraser actually originated by accident in 1770 when Joseph Priestley used vegetable gum to remove pencil marks. Since then, people have begun to invent erasers based on the properties of gum.