What's the Most Meaningful Research That Karl Young Has Done in Regard to Synchronicity?

Karl young coined the term synchronicity. He wrote an entire book about the topic after experiencing this without a doubt, sign that couldn't see happening by random chance. E have read his work on sinchronicity, but it's been quite a few years ago. But also, he and wolfgang powey, who was a quanum physicist,. Also did work together, kind of exploring basically reality, an consciousness and an or the connections between the physical and the mental.