The pursuit of knowledge.
J D
JD
Polk
D000062:Accidents, Occupational; D002677:Chile; D005544:Forecasting; D006801:Humans; D019359:Knowledge; D008511:Medicine / Q000639:trends*; D008906:Mining; D013026:Space Flight / Q000191:economics; D014481:United States; D018557:United States National Aeronautics and Space Administration