Trees are people too. Or at least they can act like them says German forrester Peter Wohlleben.
He says long before Facebook, trees established social networks to send warnings about danger along electrical impulses in their roots. Call it the world wide wood.
Trees help each other when they're sick. Wohllenben has spent his life working in forests and writes about the latest research and his observations in his book, The Hidden Lives of Trees: What They Feel How They Communicate-Discoveries From a Secret World.