Describes how COPD, or chronic obstructive pulmonary disease, is a progressive disease that makes it hard to breathe. Details the symptoms of COPD. Shows how the disease works in the lungs. Explains how progress of the disease can be slowed.
Eratosthenes of Cyrene was a Greek mathematician, geographer, poet, astronomer, and music theorist. He was a man of learning, becoming the chief librarian at the Library of Alexandria. He invented the discipline of geography, including the terminology used today. He is best known for being the first person to calculate the circumference of the Earth, which he did by comparing altitudes of the mid-day sun at two places a known North-South distance apart. His calculation was remarkably accurate. H
Making the world better, one answer at a time. The early astronomers were Nicolaus Copernicus, Tycho Brahe, Johannes Kepler, Galileo Galileo, and Sir Isaac Newton. Copernicus concluded that Earth is a planet.He proposed a model of the solar system with the sun at the center.Brahe's observations, especially of Mars, were far more precise than any made previously. Kepler discovered three laws of planetary motion.e proposed a model of the solar system with the sun at the center. Brahe's observations, especially of Mars, were far more precise than any made previously. Kepler discovered three laws of planetary motion.