Fill in the Blanks Clauses of Purpose and Compound AdjectivesOnline version Complete the text with the options given. by Diego Armando Pacheco Chaparro 1 so that for develop cleaning in powered help to to battery order up case in During the Apollo moon landings , NASA asked astronauts to collect lunar rock samples below the surface they could analyze them on Earth . But collecting moon dust was difficult - they had to be careful it floated away . So NASA developed a small - drill astronauts collect rocks more easily . In 1979 , the same technology was used the DustBuster - the first cordless vacumm cleaner on Earth . Today many of us use this type of vacuum cleaner dust around the house . But how many know of its connection to space ? 2 selling as to so best powered for high But it isn't just useful items that NASA has helped create . There are fun inventions , too , such as Super Soakers . In 1982 , NASA engineer Lonnie Johnson was working on a new type of heat pump refrigerators . He wanted to create a refrigeration system that used water provide al alternative to Freon , which is bad for the environment . He made a nozzle that , when attached to the sink , fired a stream of water across the bathroom . He realized it would be great for a - water gun ! Today , the Super Soaker is one of the world's - toys .
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