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.
Measured in terms of the HOMO and LUMO energy levels, this concept was first postulated in the 1939 book The Nature of the Chemical Bond, and the Structure of Molecules and Crystals. Its creator, a Cal Tech physicist who was rewarded with the Nobel Prize in Chemistry in 1954 for its discovery, was Linus Pauling.