 After studying the lakes of Africa, Hills and Dr Nakamura developed seed culture for a strain of 70% protein algae called spirulina that they had collected from Lake Aranguachi in Ethiopia.Later, in 1981, Dr Hills made an expedition to Lake Chiltu at the invitation of Mr. Wollie Chekal, Minister of Trade for the Ethiopian Revolutionary Government and brought back a new set of spirulina samples to his California laboratory for hybridizing an optimal strain for commercial cultivation.For millennia spirulina had been a food staple for natives of Lake Chad and also for the Aztecs but Hills funded much of the early experimentation needed for its successful modern day mass cultivation, described in Dr Nakamura's book "Spirulina