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Some algae species are 50% or more lipid oil by weight. This oil may be pressed from the algae and refined into diesel. The process for extracting algal oil, at its simplest level, resembles pressing an olive. Up to 75% from the oil might be squeezed from algae using a simple mechanical press. Hexane might be used being a solvent to raise extraction up to 95%. Once extracted, the oil is refined through transesterification. A catalyst including sodium hydroxide is combined with alcohol to make biodiesel and glycerol.
Just into the last century, furniture makers began making "woodies" as a sideline with their businesses. They would purchase a car or truck with no body, and build a physique from wood. These custom vehicles were often setup like small buses and were widely used by resorts to transport guest both to and from railroad depots. They weren?t called woodies previously. Rather, these were referred to as "depot hacks". In the horse-drawn days, a "hack" was a wagon.
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