Jan van Hooff met a poor and very sick chimpanzee “Mama”. She is quite old, almost 60. Right now she does not recognize people, but this time she remembered Jan van Hooff. A man starts to touch her, offer her some candies. And final Mama starts smiling. Jeff keeps encouraging her and chimpanzee tries to touch him. Mama suddenly looks very happy. For the past several weeks she felt very lonely and Jan is her only friend. And they hug each other. Mama starts moving. Sure she is not that young as used to be, but at least she is happy now. Chimpanzees have excellent memory. They remember almost all people who at least once had showed them sympathy.