Janet Yellen goes to China, and Beijing puts brakes on two key high-tech minerals

Treasury Secretary Janet Yellen has become the latest high-ranking U.S. government official to travel to Beijing, following Secretary of State Antony Blinken’s visit in June. But will it be enough to put U.S.-China relations back on track? And Beijing slaps export restrictions on gallium and germanium, two important minerals used in many high-tech devices. What will this mean for the global tech sector?