Secretary of Agriculture Brooke Rollins on CNBC's 'Squawk Box' discussed the state of China's pledge to purchase 12 million metric tons of soybeans by the year's end, despite only having purchased 1.5 million to date. Watch more: cnb.cx/49xscEV | CNBC

We're celebrating 30 years of Squawk Box! As we take a look down memory lane, CNBC's Becky Quick says that one of her most memorable moments on the show was when Nvidia CEO Jensen Huang randomly dropped by the set. "Memorable moments come when people are comfortable on air, and that happens here all the time," Quick said. | CNBC

Watch Chairman & CEO Wendell Weeks’ exclusive interview on CNBC's Squawk Box, where he discusses our Springboard plan upgrade and highlights the significant milestones we’re reaching across our businesses. Learn more: http://ms.spr.ly/6182qnlcr. | Corning Incorporated