By Barry Brandenberger
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Former astronauts or former National Aeronautics and Space Administration (NASA) scientists or engineers lead many of these small companies. These people believe that the commercial exploitation of space has economic potential. Whatever their goals as a company, they are all convinced that a profit can be made in space. 35 Space, Commercialization of Space Stations In 1975, participants in an Ames Research Center (a part of NASA) summer workshop created the design for what they considered to be a commercially viable space station.
The food we buy comes from farms, practically everything else we own comes from factories, and the raw materials to make them come from mines and forests. But were does it all go once we finish using it or it breaks? We put it on the curb and—thanks to trash collectors—it seems to disappear. Yet in reality, nothing disappears: We just change useful things into trash, just as we change natural resources into things we can use. This article examines how mathematics lets us calculate the amounts of trash we must either divert to beneficial uses or dispose in landfills or incinerators.
A landfill essentially is a big hole in the ground where we bury our garbage. ” Once it is full and cannot hold any more trash, a new landfill must be dug. Knowing how much waste is generated by a community helps waste managers and community planners determine how big to make a new landfill, as well as how many trash trucks are needed to collect and transport the waste. Calculations for a community start with individual households. 46 pounds of waste per day. From this, the amount of waste produced by a household of four people over a year is calculated as follows.