Three Signs of Kindness

Recently, cave explorers were travelling to the Guangji region of southern China when they saw a giant sinkhole. It was the first time in hundreds of years that explorers ventured deep inside to find out what was down there. And they found a prehistoric forest. Because of the unique way this sinkhole was formed, it's deep enough to be hidden from sight, but at an angle that the sun's light can get in. That means this amazing hidden forest can grow. Scientists say there are probably hundreds of species of plants and bugs and animals hidden in this forest - some never seen by humans before.