Theory of relativity The theory of relativity, or simply relativity in physics, usually encompasses two theories by Albert Einstein: special relativity and general relativity.[1] Concepts introduced by the theories of relativity include: Measurements of various quantities are relative to the velocities of observers. In particular, space contracts and time dilates.Spacetime: space and time should be considered together and in relation to each other.The speed of light is nonetheless invariant, the same for all observers. The term "theory of relativity" was based on the expression "relative theory" (German: Relativtheorie) used in 1906 by Max Planck, who emphasized how the theory uses the principle of relativity. In the discussion section of the same paper Alfred Bucherer used for the first time the expression "theory of relativity" (German: Relativitätstheorie).[2][3] Scope[edit] The theory of relativity transformed theoretical physics and astronomy during the 20th century. Two-theory view[edit] History[edit]
Biocentrism (cosmology) Biocentric universe (from Greek: βίος, bios, "life"; and κέντρον, kentron, "center") — also known as biocentrism — is a concept proposed in 2007 by American doctor of medicine Robert Lanza, a scientist in the fields of regenerative medicine and biology,[1][2][3] which sees biology as the central driving science in the universe, and an understanding of the other sciences as reliant on a deeper understanding of biology. Biocentrism states that life and biology are central to being, reality, and the cosmos — life creates the universe rather than the other way around. It asserts that current theories of the physical world do not work, and can never be made to work, until they fully account for life and consciousness. Critics have questioned whether the theory is falsifiable. Hypothesis[edit] Lanza has said that he intends to publish aspects of biocentrism in peer-reviewed scientific journals.[17] Synopsis of Lanza's book Biocentrism[edit] Reception[edit] See also[edit] References[edit]
10 Awesome Online Classes You Can Take For Free Cool, but you need iTunes for nearly everything, and that gets an 'F.' Are there really no other places to get these lessons? I was sure there are some on Academic Earth. Flagged 1. 7 of them are available via YouTube. 2. iTunes is free. 1. 2. Don't worry, we're looking out for you! While I have no personal beef with iTunes, I know that many people share your sentiments — so I actually made a concerted effort to include relevant youtube links when possible.
Signs of ageing halted in the lab 2 November 2011Last updated at 18:01 By James Gallagher Health reporter, BBC News Will it one day be possible to stop ageing? The onset of wrinkles, muscle wasting and cataracts has been delayed and even eliminated in mice, say researchers in the US. It was done by "flushing out" retired cells that had stopped dividing. The scientists believe their findings could eventually "really have an impact" in the care of the elderly. Experts said the results were "fascinating", but should be taken with a bit of caution. The study, published in Nature, focused on what are known as "senescent cells". These cells are cleared out by the immune system, but their numbers build up with time. Cleanup Scientists at the Mayo Clinic, in the US, devised a way to kill all senescent cells in genetically engineered mice. The animals would age far more quickly than normal, and when they were given a drug, the senescent cells would die. Eternal youth?