Your doctor may need to change the doses of your medications or monitor you carefully for side effects. ... Metformin side effects can also affect other parts of the body. It can leave a metallic taste in the mouth, cause heartburn or headache, flushing of the skin, nail changes or muscle pain. More serious metformin side effects include chest pain or rash. ...
Early String Theory. The first attempt to construct a physical model of an atom was made by William Thomson (later elevated to Lord Kelvin) in 1867. The most striking property of the atom was its permanence.
John Dalton, the father of atomic theory, by Charles Turner. Credit: Wikipedia. Atomic theory â that is, the belief that all matter is composed of tiny, indivisible elements â has very deep roots. Initially, the theory appeared in thousands of years ago in Greek and Indian texts as a philosophical idea.he findings became the basis of of Daltonâs Atomic Laws or Model, which focuses on five basic theorems. The first states that elements, in their purest state, consist of particles called atoms. Second, the atoms of a specific element are all the same, down to the very last atom.