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Primatologist Christophe Boesch demonstrates and discusses nut cracking, an aspect of chimpanzee behavior. Primatologist Christophe Boesch explains that declining chimpanzee populations threatens the study of chimpanzee culture. Who is more likely to help out, a child or a chimp? Psychologist Felix Warneken explains how his researched found answers to this question. Do chimps cooperate even when they’re not related? The traditional answer is no, but primatologist Linda Vigilant explains how genetics is revising this belief. Primatologist Josep Call discusses research designed to test primates’ ability to plan for the future. Primatologist Josep Call discusses research designed to test primates’ ability to solve problems. Primatologist Josep Call explains why it would be interesting to know whether primates can remember and repay favors. Psychologist Felix Warneken explains the importance of observing chimp behavior both in the wild and in controlled experimental environments. Primatologist Christophe Boesch demonstrates and discusses a hive raiding, an aspect of chimpanzee behavior. In this interview from Greenland, glaciologist Mark Fahnestock describes the roar of a 1000-foot iceberg dropping off the Jakobshavn Isbræ into the Ilulissat Icefjord. Includes time-lapse photography of this massive calving event.