A list of the world’s mysteries might include what was Stonehenge’s purpose? What is the origin of dark matter in the universe? And why on earth is German Chancellor Olaf Scholz stalling tank deliveries to Ukraine?

Mr. Scholz is dragging his feet on new tanks as Kyiv begs the West for the weapons to build on the momentum of its recent advances against Russia’s invaders. Berlin in April promised to provide Cheetah anti-aircraft tanks, and then waited until July to start delivering them. As of this week, Berlin’s defense ministry says 24 have been sent.