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.
By basing its foundation on string theory instead of conventional particles, they lent more credibility to the potentially unifying theory. Whether string theory is the ultimate theory â the theory of everything â is unknown. But it is a strong contender for explaining the inner workings of the universe.