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.
The English used in this article or section may not be easy for everybody to understand. String theory is a set of attempts to model the four known fundamental interactionsâgravitation, electromagnetism, strong nuclear force, weak nuclear forceâtogether in one theory. This tries to resolve the alleged conflict between classical physics and quantum physics by elementary unitsâthe one classical force: gravity, and a new quantum field theory of the other three fundamental forces. Einstein had sought a unified field theory to explain the fundamental interactions within one ...