Dmitri Mendeleev
Unaware of the earlier work on periodic tables going on in the 1860s, he made the following table:
By adding additional elements following this pattern, Mendeleev developed his extended version of the periodic table. On 6 March 1869, he made a formal presentation to the Russian Chemical Society, titled "The Dependence between the Properties of the Atomic Weights of the Elements", which described elements according to both atomic weight (now called "relative atomic mass") and valence. This presentation stated that
Edgar James Banks
Banks is credited with the discovery of the Plimpton 322 tablet in Southern Iraq. It is believed to be the world’s oldest trigonometric table, predating Hipparchus by around 1000 years and, using base 60, also the most accurate trigonometric table, avoiding inexact numbers. It thus displayed knowledge of the Pythagorean theorem long before the birth of Pythagoras himself. The ancient cuneiform tablet was sold to the New York publisher George Arthur Plimpton, reportedly for $10. It was housed in Plimpton's private collection before being donated to Columbia University upon Plimpton's death. The artifact, now famously known as Plimpton 322 (denoting that it is the 322nd item in the catalog), has provided great insight into the Babylonian era mathematics.