September 2022
What signs do the Hong Kong China Gold Association do on jewelry? And why are the signs of China Gold and Chinese Gold in Hong Kong different?
I bought a golden necklace in China in Hong Kong, which should not be fake, how can you help everyone help?
How to evaluate and calculate the power station revenue?
Install a photovoltaic power plant, but don't know how to evaluate and calculate your own electricity revenue? Do not know each householder to has had such trouble? Whether you have or not, after reading this article today, you are sure to get the answer you want! After household photovoltaic installation, what is the revenue situation? …
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Is there a gift for students?
Education is over. I want to give us a small gift to our 41 students. The budget is within 120, except sugar!
For the first time, scientists have produced oxygen on Mars
Due to the limited resources and population capacity of the Earth, when the number of human beings reaches the threshold, it is necessary to migrate from outer space. Considering the limited level of science and technology at present, and the distance between stars and stars in the universe is often several light years, the target …
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Whether the universe is 13.8 billion years old and has a boundary
For thousands of years, humans believed that the Earth was the center of the universe, and that the stars at night and the sun at day revolved around it. When humans invented telescopes and even went out of the Earth, they finally found that beyond the earth was a much larger space, containing hundreds of …
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Forty-five years later, the Voyager probes are still flying, reaching Proxima Centauri in 70,000 years
If one day humans disappeared, the earth became riddled with holes in disasters, high-rise buildings were gradually ground into rubble by nature. Is there anything in the universe that can prove the existence of brilliant human civilization? The answer is yes, it is not only on the earth, but from the tens of billions of …