Extragalactic cosmic ray Extragalactic cosmic ray Extragalactic cosmic rays are very-high-energy particles that flow into the Solar System from beyond the Milky Way galaxy. The energies these particles possess are in excess of 10 eV. Unlike solar or galactic cosmic rays, little is known about the origins of extragalactic cosmic rays. This is largely due to a lack of statistics: only about 1 extragalactic cosmic ray particle per square meter per year reaches the Earth's surface (see figure). There are many ideas about which processes may be responsible for cosmic rays with such high energies. In the 'bottom-up' approach, cosmic rays gain more
Beyond Civilization the revolution. Daniel Quinn coined the term "new tribalism", which appears in "", "My Ishmael", and, finally, in the most detail, in "Beyond Civilization". He often discusses the proliferation of this new tribalism in terms of a New Tribal Revolution, analogous to the Industrial Revolution in that it refers to a gradual, sociocultural period of change and creative outpouring as opposed to a single, violent, political uprising. Quinn asserts that new tribalists believe that the tribal model, though not absolutely "perfect", has obviously stood the test of time as the most successful social organization for humans, in alignment with natural