Not long after the species' greatest champion, the American zoologist Dian Fossey, was killed in Rwanda in 1985, there were fewer than 300 of the giant primates left in the wild.

CNN: Up close with Rwanda's endangered mountain gorillas

Rwanda, in particular, has developed a lucrative eco-tourism industry based on rich foreigners who wish to follow in the steps of Dr Schaller and of Dian Fossey, an American researcher who brought the gorillas' plight to the world's attention, and was later murdered, probably by poachers who did not welcome the publicity.

ECONOMIST: The number of mountain gorillas appears to be rising

The Karisoke Research Center, operated by the Dian Fossey Gorilla Fund International and located in Volcanoes National Park, is the world's most important facility for studying the mountain gorilla.

CNN: Up close with Rwanda's endangered mountain gorillas

"I have a child and one day a male guest was full frontal, " said Dian Chen, an artist, who has lived in Manhattan Plaza since 1978.

WSJ: Hotel Offers Rooms With Risqu�� Views

ADNI's anagram DIAN, the Dominantly Inherited Alzheimer Network, based at Washington University in St Louis, is taking another approach to the biomarker question.

ECONOMIST: Alzheimer's disease