Why is the snow white

Published on in category Physics
Why is the snow white Snow is a form of ice and it seems transparent to us. The white impression is caused by its thickening in the form of a snow cover, which is formed by many snow crystals. They reflect and refract light in different directions, and our brain perceives this summary effect as white. Read more

Why the Great Wall of China was built

Published on in category History
Why the Great Wall of China was built The Great Wall of China is not a single wall. These are a number of longer or shorter sections that originated from the 8th century BC until the fall of the Ming Dynasty in 1644. But what were the reasons for the construction of the largest fortification complex in human history? Read more

Why is the Yellow River yellow

Published on in category Geography
Why is the Yellow River yellow The Yellow River is the second longest river in China, after the long river, and the sixth longest river in the world. The answer to the question of “why it the Yellow River yellow” and the Long River long is relatively simple with a little sarcasm. But is it really so? How far does the beginnings of the Yellow River name go? Read more

Why the Aral Sea dries up

Published on in category Geography
Why the Aral Sea dries up Before 1960, the Aral Sea covered an area of 68,000 km2. Now, divided into two separate parts, it does not have in total even 6,800 km2, i.e. 10 % of its original area. What were the causes of this huge natural disaster and what consequences did it bring to life around the lake? Read more

Why invest in gold

Published on in category Finance
Why invest in gold It is said that gold can preserve the value of money and overcome financial crises. It is an investment tool that can be speculated with. But what are the reasons for the decision to invest in gold? Read more

Why to get married

Published on in category Society
Why to get married In human society, marriage is a very old concept of sexual cohabitation of two or more partners of different or the same sex, but still most often between one man and one woman. But is marriage necessary in today's relatively liberal world? What are the main arguments for getting married? Read more

Why is it dark at night

Published on in category Physics
Why is it dark at night The question "why is it dark at night" was asked by scholars many centuries ago. However, they could not find the answer. Although the question seems relatively straightforward, the answer to it is not easy. At least not without the knowledge that science brought in the early 20th century. So why is it dark at night? Read more

Why the Paris Agreement was signed

Published on in category Nature
Why the Paris Agreement was signed The Paris Agreement, negotiated in 2015 and signed in 2016, aims to reduce greenhouse gas emissions and keep the global average temperature well below 2 °C above pre-industrial levels of around -0.3 °C, and trying to do the best so that the temperature does not exceed the limit of increase of 1.5 °C compared to the values before the industrial revolution. Given the observed global warming trend, this is a truly ambitious plan. But why did the agreement come about at all? What were the key stimuli? Read more

Why we sort waste

Published on in category Nature
Why we sort waste Recycling was common in ancient times, where the main reason was the high price of raw materials and production itself. Later, in the pre-industrial era, for example, paper was sorted in Japan and ash was collected in Great Britain, which was used in the manufacture of bricks. But what are the reasons now? Read more

Why the British handed over Hong Kong to China

Published on in category History
Why the British handed over Hong Kong to China On July 1, 1997, Hong Kong changed its status from a British colony to a special administrative region of the People's Republic of China. The handover took place formally on the previous day with the participation of the leading representatives of the two powers, Prince Charles on the one hand and by President Jiang Zemin on the other. But why did the British hand over Hong Kong to China? What preceded this act? Read more