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The invention of papermaking. In 105 AD, Cai Lun summed up the experience of his predecessors in Luoyang, the capital of the Eastern Han Dynasty, and improved the papermaking technique, using bark, hemp head, rags, old fishing nets, etc. as raw materials to make paper.
Polyacrylic acid (PAA) is a water-soluble polymer, colorless or light yellow liquid. It can form stable compounds with metal ions, calcium
If you really live in the wilderness, then: water is definitely the biggest factor in determining how long you can live. Not only must there be water but also clean and sterile fresh water.
Pour boiling water into the thermos cup and tighten the cork or lid clockwise for 2-3 minutes, then touch the outer surface of the cup body with your hands.
Bento has existed since ancient times, and in modern society, it is more common due to the continuous growth of office workers. A delicious and nutritious bento can not only supplement the body's needs, but also make the mood happy.
What is a good dish to bring for lunch? 3 dishes that are suitable for lunch boxes, not easy to spoil and nutritious!