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There is a saying that goes the inventions created in the last 40 years are more than all the inventions before. Ancient people used candles for lighting over thousands of years. They never thought about another thing cpuld replaced candles until Edison invented bulbs. Nowadays, bulbs have already been replaced by LED light , and people still try their best to improve the lights. They remove the blue ray and UV rayout of the spectrum, and add more red ray whose wave length are around 650 nm. It's really good for eyes. Meanwhile , people are concerned about what kind of new things will be created the next year. Should they buy one right now or wait for the new arrivals. This is very similar to buying phones. We just buy a phone which has a lot of new features, but it improved to be better a few days later. This makes everyone feel sad! If we observe our lives, all the things and devices we use are quite related to electricity. Electricity changed the world. The need of electricity increases day by day. What can we use to create electricity in the future without polluting our environment?
2025年1月8日
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