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Einstein's Theory of General Relativity

In 1905, Albert Einstein determined that the laws of physics are the same for all non-accelerating observers, and that the speed of light in a vacuum …

7 Essential Habits of Happier People (How Many Do You Possess?)

Happiness: everyone wants it, yet relatively few seem to get enough of it, especially those in their early forties. (That's about the time many of us …