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Ten Most Extreme Substances Known to Man. Io9. We come from the future. 10 Awesome Online Classes You Can Take For Free. Cool, but you need iTunes for nearly everything, and that gets an 'F.'

10 Awesome Online Classes You Can Take For Free

Are there really no other places to get these lessons? I was sure there are some on Academic Earth. Flagged. 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] (The word relativity can also be used in the context of an older theory, that of Galilean invariance.)

Theory of relativity

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. Neutrino. Neutrinos do not carry electric charge, which means that they are not affected by the electromagnetic forces that act on charged particles such as electrons and protons.


Neutrinos are affected only by the weak sub-atomic force, of much shorter range than electromagnetism, and gravity, which is relatively weak on the subatomic scale. Therefore a typical neutrino passes through normal matter unimpeded. Most neutrinos passing through the Earth emanate from the Sun. About 6.5×1010 solar neutrinos per second pass through every square centimeter perpendicular to the direction of the Sun in the region of the Earth.[2]

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 (cosmology)

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. While physics is considered fundamental to the study of the universe, and chemistry fundamental to the study of life, biocentrism claims that scientists will need to place biology before the other sciences to produce a theory of everything.[4] 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?

Signs of ageing halted in the lab

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. They accumulate naturally with age.