Scientific American – December 2021
English | 100 pages | True PDF | 18 MB
《科学美国人》是一本美国科普杂志。许多著名的科学家，包括阿尔伯特·爱因斯坦，都为它贡献了文章。自 1845 年开始印刷，它是美国历史最悠久的连续出版的月刊。
Scientific American is an American popular science magazine. Many famous scientists, including Albert Einstein, have contributed articles to it. In print since 1845, it is the oldest continuously published monthly magazine in the United States.