11 'crazy' facts in the world that make sure 90% of us have never heard of

The society is growing, the knowledge is also expanding. Every day, we learn a lot more, maybe from books, documents, newspapers . but it is not enough. The world will always surprise you, the same way the facts below do.

1. More people die from selfies than shark bites

Photos harmless? No! You may not believe it, but there are actually many people in the world who die of taking selfies without paying attention to their surroundings.

In September 2015, a 66-year-old tourist fell through a selfie and fell down the stairs at Taj Mahal, only to die soon after. According to statistics, it is the 12th case of death from selfie shooting, while at the same time only 8 people died under the shark jaw.

2. Today's aircraft fly much slower than the 20th century

These are figures coming from reality. Today, a flight from New York to Houston takes about 4 hours, but in 1973 it takes less than 3 hours on the same journey.

The reason is because of fuel. The price of fuel has risen sharply compared to the previous day, and then the airlines realized that they could save millions of dollars each year just fly slower than before.

3. Oh my god, believe it: Cleaning the house is as dangerous as smoking

The cause lies in the chemicals we use when cleaning. The chemicals in cleaning water can increase the risk of asthma by 43%. They can stimulate the organ that produces mucous membranes in the nose, changes the trachea and makes it work less effectively in the future.

4. How many types of apples do you think? If you eat one type of food daily, it will take more than 20 years to try it all

There are more than 7,500 types of apples in the world, and the number will increase in the future. If you eat an apple a day, it will take you more than 20 years to try it all, because 20 years, there are only about 7,300 days.

5. If named, a cow can add more than 250 liters of milk a year

This is a real study by experts from Newcastle University. They found that the cows that are named and called every day, loved and caressed regularly will produce more milk than the normal cow by 258 every year.

The reason is that this process helps the cow to relax, thereby releasing less stress hormones and helping them to produce more milk.

6. If you write out a full pencil, you can draw a 57km long line

But usually no one can reach this milestone. Toàn died first.

7. Chinese people used knives to replace money

Chinese in the Zhou Dynasty (period of 600-200 BC) used bronze knives to exchange goods, like a currency.

8. The Egyptians knew how to play bowling 5,000 years ago

It was thought of a modern game, but bowling was actually a game invented by ancient Egyptians 5,000 years ago.

At that time, they played in a large hall, the pitch was about 4m long and for 2 players.

9. Only 5 countries have never been invaded by European colonists

During the period of aggression in the 16th century to the 1960s, it can be said that almost every country in the world became a colony of European colonists. There are only 5 countries that are out of this story: Korea, Korea, Japan, Thailand and Liberia.

10. For 1 teaspoon of honey, 12 bees will have to work hard to death

A bee has an average life of 4-5 years, and for a lifetime they can only produce enough honey for 1/12 of a teaspoon of tea.

11. We have gold in our bodies

But at least. A person weighing 70kg contains about 0.2mg of gold inside him.