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5 trivia facts about gold:
1. The gold on the earth's surface comes from the fact that two "neutron stars" collide with each other, and the gold element produced forms a meteorite that hit the earth 3.9 billion years ago.
2. If all the yellow on the surface is melted away, it can be cast into a large gold nugget with a side length of 22 meters.
3. If this gold is divided equally among everyone in the world, each person can get 1 ounce (28 grams) of pure gold - this is worth 1,500 US dollars, about 10,000 yuan of coins.
4. At present, more than half of the gold mined by human beings is made into "jewelry", the second largest use is "personal investment", and the third is the central bank reserves of various countries (accounting for 17% of the total gold).
5. About a quarter of the earth's gold remains unmined – if humanity continues to mine at its current efficiency, within 20 years, all gold on the surface will be mined.