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The experiment of Space Colonies endangers only the experimenters . Explore the science of genetics from the 19th-century experiments of Gregor Mendel to the gene-splicing edge of modern biotechnology . Many psittacines , including the budgerigar , Melopsittacus undulatus , are known for their ability to mimic a variety of sounds including human speech , Yet , so far as we know , the classic experiments of deafening , isolation-rearing and song tutoring aimed at delineating the roles of auditory feedback and external acoustic models have not been conducted with psittacines . The experiment of bringing out English laborers has failed in the instance of all but two of the eight men who , according to the original contract , have worked on the plantation all the winter , and are now engaged in the lumber business in the pine woods near it , till next winter , when they will again return to work on the rice-crop .