Newly discovered notes from 15th-century Italy show that the decimal point is actually 150 years older than what historians previously believed. Decimal points may seem basic, but they’re incredibly helpful in math. They divide whole numbers into tenths, hundredths, and thousandths, which makes calculations a lot easier compared to using fractions. Some forms of decimals have been around since the 900s in Damascus and the 1200s in China, as reported by Live Science. A solid system of decimals didn’t become fully established until 1593. This happened when the German mathematician Christopher Clavius included decimals in astronomical work. However, recent studies...