coming from the ocean floor. Or, from leaks that happen when we use petroleum products on land. For example, gasoline that sometimes drips onto the ground when people are filling their gas tanks, motor oil that gets thrown away after an oil change, or fuel that escapes from a leaky storage tank. When it rains, the spilled products get washed into the gutter and eventually go to rivers and the ocean. Another way that oil sometimes gets into water is when fuel is leaked from motorboats and jet skis. A refinery is a factory where crude oil is processed into petroleum products. Because many different pollutants can escape from refineries into the air, the government monitors refineries and other factories to make sure that they meet environmental standards. When a leak in a storage tank or pipeline occurs, petroleum products can also get into the ground, and the ground must be cleaned up. To prevent leaks from underground storage
which he invited numberless scientists. The presence of the manuscript at his court in Prague was later proved by the discovery in a margin of the autograph of Johannes de Tepenecz, a Bohemian scientist who was a favorite of Rudolf. Marci also reported the belief that the author of the manuscript was Roger Bacon, the English Franciscan friar who lived from about 1214 to 1294. Bacon had speculated, centuries before they became reality, on the possibility of microscopes and telescopes, motorboats, horseless carriages, and flying machines. Popular legend credited him with great magical abilities, a reputation probably enhanced by his extensive writing on alchemy. He interests modern science because of his precocious emphasis on observation of natural phenomena, so unlike the a priori scholasticism of his time. He is not to be confused with Sir Francis Bacon, the English statesman who lived from 1561 to 1626, wrote the famous Essays, and largely shaped modern science through
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