Technology / Rockets / Estes: Estes is one of the first companies that started it all way back in 1959 when they introduced the Scout, a tumble recovery rocket which was this company's (and the world's) first model rocket. A large number of plans for older Estes rockets can be found at JimZ's web site. Estes is currently the largest manufacturer of model rockets in the world at this time.
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Science / Biology / Testes: The male gonad; produce spermatozoa and male sex hormones. Male gonads in mammals. Singular, testis. Paired organs that contain seminiferous tubules in which sperm are produced. MORE
Technology / Rockets / Centuri: Centuri was Estes' main competitor in the model rocket business until Estes bought them out in the early eighties. They made a number of very interesting designs, the plans for many of which can be fo MORE