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Chimpanzees Won't Give Back These Crystals. What They're Doing With Them Is Stranger Still  Indian Defence ReviewChimps Seem To Love Crystals. It Could Solve 780,000-Year-Old Mystery  SciTechDailyScientists give crystals to chimpanzees, and their unexpected reaction may reveal an ancient mystery about the origin of humankind's fascination with shiny stones.  CPG Click Petróleo e GásCHIMPS CRYSTALS 3  The Virgin Islands Daily NewsChimpanzees have a strange fascination with crystals, similar to many humans  Earth.com