8 interesting facts in life, 90% of people don't know

The series of interesting facts below is an example that will make you feel surprised about the objects and events around us.

1. A messy bed is better for our health

Arrange furniture neatly, clean will make our living environment more airy and comfortable. But it seems that this standard is not true for making the bed.

A new study from Kingston University shows that leaving blankets indiscriminately on sheets and mattresses after waking up can kill about 1.5 million dust mites, thereby protecting our health better than with folding.

2. Men's tongues are longer than women's

A study conducted at the University of Edinburgh showed that the average tongue length of adult men is 8.5 cm, while that of women is 7.9 cm.

3. Lobster used to be prison food

Lobsters are now an expensive ingredient, but they were once a delicacy for prisoners.

In the 1880s, the number of lobsters on the beaches of the Massachusetts Bay Colony increased dramatically, so much so that it was called "poor protein". With an affordable price, lobster was then selected for prison food.

4. Eiffel Tower can be 15cm taller during summer

The Eiffel Tower, the symbol of France, grows almost 6 inches (about 15 cm) tall in the summer, when the temperature is above 40°C. The reason is that the high temperature causes the metal materials to expand, leading to an increase in the height of the tower. In addition, the heat in the summer can also cause the top of the tower to tilt up to 17cm.

5. YouTube started out as a dating app

Everyone knows that YouTube is a globally famous video viewing application. However, an interesting fact is that originally, YouTube was created with the purpose of helping users to date. YouTube launched on Valentine's Day February 14, 2005, allowing people to upload videos of their own profiles, to find people who want to date them. Later, people shared every video about themselves and the life around them, making the YouTube community what it is today.

6. Men with daughters live longer

A team of scientists found that a father's life expectancy increases by 74 weeks for each daughter born. This means that the number of daughters positively affects the life expectancy of their fathers. Meanwhile, the life expectancy of fathers was not affected by the number of sons.

7. Eraser was invented 200 years after the pencil

Pencil has appeared and accompanied us for 400 years, but the beautiful little eraser behind its tail appeared only 200 years ago.

Before that, to cover pencil marks or erase wrong marks people used sponges or even bread crumbs.

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

In 1901, the government in California, USA banned homework for students under the age of 15. This is because some doctors and teachers have argued that homework causes stress in children, leading to a negative impact on children's health. However, this order was repealed in 1917.