the minimum mass of fissionable material that can sustain a chain reaction
the minimum amount (of something) required to start or maintain a venture; "the battle for the computer market has now reached critical mass"; "there is now a critical mass of successful women to take the lead"; "they sold the business because it lacked c
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GPS means
a navigational system involving satellites and computers that can determine the latitude and longitude of a receiver on Earth by computing the time differe... more
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