Videos Russia and China are ahead of the US in developing and testing hypersonic missile technology, especially when it comes to building wind tunnels. CNN’s Kristin Fisher has the details. #CNN #News Articles You May Like ‘You look cute’: Obama jokes with a supporter Man makes 999 call over Uber Eats delivery fail JetBlue flight makes emergency landing after passengers injured 20 years in the making: Grand Egyptian Museum officially opens Rio Ferdinand: Beckham is a ‘symbol of success’