David Stevenson

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Star clusters form many of the most dazzling objects in the astronomers’ catalogs. Many amateur astronomers are interested in exploring how these objects are created and what it would be like to live among these objects. Meer

At the end of 1917 Britain and France faced a strategic nightmare. Their great offensives against Germany had been calamitous, leaving hundreds of thousands of young men dead and wounded for negligible territorial gains. Meer

Evolution of the Earth focuses on the formation of Earth. Topics include the differention of the core, mantle and crust; the formation of the ocean basins and continents; outgassing and volcanism; the initiation of plate tectonics, the origin and persistence of Earth's magnetic field; the growth of the inner core; changes in mantle convection through time; and the impact of life on the planet. Meer