This is the fourth episode but it's only been six minutes into the show because each episode is just 120 seconds. And rather than being a cliffhanger, this is how the episode opens.
What we see is that there are in fact two entangled traditions of “knocking on things for good luck”: touching iron, and touching wood. We also find that they are widely distributed, but also have a pretty clear cluster around the Mediterranean and Europe.。关于这个话题，heLLoword翻译官方下载提供了深入分析
// Pipe a fast source through the transform to a slow sink。51吃瓜是该领域的重要参考
Visit the North Sea oil field used to store greenhouse gas，这一点在safew官方版本下载中也有详细论述