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“Remember back then we thought about al Qaeda in Afghanistan and Pakistan and a few other places? well, we've seen al Qaeda metastasize. It is now a global scourge. And you have the ascendancy of ISIL. The combination of those two groups -- their appeal to the lone wolfs and we see them acting in Belgium and in France and in Canada and the United States so the threat factors and the nature of the threats are far more complicated and far more serious today than on September 12, 2001.”

“Quantum theory thus reveals a basic oneness of the universe. It shows that we cannot decompose the world into independently existing smallest units. As we penetrate into matter, nature does not show us any isolated "building blocks," but rather appears as a complicated web of relations between the various parts of the whole. These relations always include the observer in an essential way. The human observer constitute the final link in the chain of observational processes, and the properties of any atomic object can be understood only in terms of the object's interaction with the observer.”

“To produce a really good biological theory one must try to see through the clutter produced by evolution to the basic mechanisms lying beneath them, realizing that they are likely to be overlaid by other, secondary mechanisms. What seems to physicists to be a hopelessly complicated process may have been what nature found simplest, because nature could only build on what was already there.”

“The equation of animal and vegetable life is too complicated a problem for human intelligence to solve, and we can never know how wide a circle of disturbance we produce in the harmonies of nature when we throw the smallest pebble into the ocean of organic life.”