If you're wondering why U.S. stocks are selling off Tuesday morning, Kevin Hincks says look no further than South Korea and its 10% fall in the KOSPI. Samsung and SK Hynix led that downside action overseas. Kevin tells investors to keep an eye on U.S. AI memory stocks like SanDisk (SNDK), Western Digital (WDC), and especially Micron (MU) as it reports earnings Wednesday. The selling action is overshadowing positive developments between the U.S. and Iran as crude oil falls to the lowest levels since early March.