Decimal point, a mathematical symbol written as ".",is used to separate the integer part from the decimal part in decimal system. Although the decimal point is small, it plays a great role. We can't ignore this little symbol at any time. Because of this humble mistake, mankind has brewed one tragedy after another. It can be described as "a thousand miles away." 1967, the former Soviet Union "Union 1" crashed, causing irreparable losses. The direct reason is that a decimal point was ignored in the ground inspection ... resulting in hundreds of millions of dollars in wealth loss, and human beings also lost the life of a space hero-komarov.