tisdag, 15:45 
David Attenborough's Natural Curiosities
documentaire, natuur, E4, S4, 2017
Can animals count? This is question that has intrigued and fooled investigators for a long time. Just over 100 years ago, a German horse called Hans was declared a mathematical genius but all was not as it seemed. Some bamboos around the world flower exactly at the same no matter where they are. Are they counting down the years?