sentences:  One of the more controversial experiments was conducted in 1951, when a disproportionate number of African Americans were exposed to the fungus "Aspergillus fumigatus", to see if they were more susceptible to infection.Some scientists reasoned that such knowledge would help them prepare a defense against a more deadly form of the fungus.The same year, workers at the Norfolk Supply Center in Norfolk, Virginia, were unknowingly exposed to "Aspergillus fumigatus" spores.