Kurzgesagt - In a Nutshell (2013) : 14x1

Trees are among the most fascinating life forms on Earth, but what makes them truly fascinating is hiding underground! They are able to break solid rocks with hydraulic roots, all while working together with the underground fungal networks that can stretch for kilometers. Above and below, trees are running biological empires we’re only beginning to understand. How does something so massive survive with roots growing so shallow? What are trees really made of and how are they able to grow so big?