The interesting thing about gold may be unknown to you

The occasion of the wedding, the special anniversary . the most popular gift is gold. Good luck at the beginning of the year, many people choose to buy gold. What do you know about this metal?

Gold is a transition metal that is soft, flexible, easily laminated and does not react with most chemicals. It is one of the precious metals in the world, behind its sparkling beauty is many interesting things not everyone knows.

Behind the metal is many interesting things - (Photo: The Glamourai).

80% of the gold on Earth has not been found yet

Gold can be found on all 7 continents. A total of 166,500 tons of gold has been mined in world history, if casting them into a cube will have a 20.5m long edge. If you melt the gold, it will fill an Olympic standard swimming pool.

166,500 tons of gold so far are divided into 4 main components according to application, of which the most popular gold is used as jewelry (50.5%).

Then used as a private investment (18.7%), then used for reserves for the world government (17.4%), and finally used in industry (13.4%).

Technicians treat liquid gold into gold pieces - (Photo: REUTERS).

75% of the gold that people possess is exploited from 1910 back here. During the previous millennia, people only found 25% of the total gold available.

Archaeologists believe that humanity began to discover and use gold in 5,000 BC. Scientists say that an estimated 80% of the Earth's gold has not yet been found.

Many argue that gold is likely to lie very deep underground so humans cannot exploit them in the near future.

The first gold coin used by people living in Lydia (part of Turkey) was about 560 years BC. Legend has it that gold came from the river Pactolus, where King Midas lost his ability to turn things into gold.

China consumes the most, South Africa has the largest reserves

With 1 gram of gold, one can laminated into a 165m long string with the diameter of a human hair.

Because gold is a perfect conductor, it is used in many industrial applications. Many stories circulated in the folk that the Chinese emperors also used thin gold to make embroidery in luxurious carpets or sew the royal palace.

Sports also use gold. In the past, people used real gold to create gold medals for champion athletes. From 1912, the Olympic Committee stopped using 24K gold as a medal. Today's gold medal is only about 6 grams of gold.

Gold is also used in astronaut sunglasses - (Photo: NASA).

Today gold is also used in astronauts' glasses and hoods. Gold plays a useful role in reflecting infra-red rays from the sun, helping astronauts' caps of heat gain.

About 13% of gold is used as coins to be placed in national central banks or purchased from investors. The rest are used for other purposes such as industrial and dental applications.

The gold reserve statistics of the government and monetary organization worldwide in 2012 showed that the US held the most, followed by the IMF monetary organization, then to Germany, Italy and France. Until May 2016, this order remained unchanged.

According to Business Insider, China buys the most gold jewelry in the world in 2016. According to a report, South Asian countries import about 800 tons of gold each year and use about 600 tons of them to make jewelry.

South Africa has the largest gold reserves in the world. In the past 130 years, an average of 40% of the world's gold has been exploited in this country.

The largest gold ore that exists today is being preserved in Las Vegas - (Photo: REUTERS).

The largest gold ore in the world ever found "Welcome Stranger" , found in Victoria, Australia in 1869, weighs 71kg including 65kg of pure gold.

The largest surviving ore mass known as "Hand of Faith" found in Australia in 1980 weighs 27kg and is currently on display in Golden Nugget Cassino in Las Vegas.