On September 6, 1766, in Eaglesfield, England, Dalton was born. Dalton was born in a family of 5 including his two siblings Mary, his sister, Jonathan, his brother, and his parents Deborah Greenup and Joseph Dalton. John grew up in a poor family with his father having a modest income he gave his family their basic needs; thus, he needed to help out his family financially at a young age. After attending a Quaker school in his village in Cumberland, when Dalton was just 12 years old he started teaching there. When he was 14, he spent a year working as a farmhand but decided to return to teaching; however this time as an assistant at a Quaker boarding school in Kendal. In 1793, he became a math and philosophy tutor at New College in Manchester, as well as studying color blindness. He studied color blindness because both he, and his brother were color blind, and he identified red-green color blindness through his studies. Furthermore, during his time at New College, he pursued his interest in Meteorology, as well as having an interest in Physics and most importantly Chemistry. Later in his studies, he developed a method to calculate atomic weights, as well as stating that particles in different gases had different volumes, in other words, a mixture of gases would not simply layer out but kept in constant motion. He then died in Manchester, England, in 1844. Research is an essential part of being influential. So, most scientists and famous scientists at that research on a matter and theorize about it that they eventually prove something or propose something to the world of Science, and that is what John Dalton did. During the 19th century, John Dalton began a series of experiments, which led him to propose the theory of atomic compositions. Dalton came up with his theory of atoms as a result of his research on gases. Furthermore, he began his experiments on gases in the 1800s, and in the course of his research into gases, Dalton also discovered that certain gases could only be combined in certain proportions. He built on the laws and theories of others in his era, as well as creating his law of multiple proportions, which states that two elements can be combined to form a number of possible compounds. Dalton’s contributions to the atomic theory had four main parts. First of all, Dalton hypothesized that the law of conservation of mass and the law of definite proportions could be explained using the idea of atoms. He knew that all matter is made of tiny indivisible particles called atoms. The second part states, that every single atom of an element, such as gold, is the same as every other atom of that element. He also said that the atoms of one element are different from the atoms of all other elements. In the third part of Dalton’s atomic theory, he proposed that compounds are combinations of two or more different types of atoms. An example of such a compound is table salt. Table salt is a combination of two separate elements with unique physical and chemical properties. The first, sodium, is a highly reactive metal. The second, chlorine, is a toxic gas. When they react, the atoms combine in a ratio to form white crystals of NaCl/N, a, C, l, which we can sprinkle on our food. In the final part of Dalton’s atomic theory, he suggested that chemical reactions don’t destroy or create atoms. They merely rearranged the atoms. Using our salt example again, when sodium combines with chlorine to make salt, both the sodium and chlorine atoms still exist. They simply rearrange to form a new compound.