With the rapid expansion of the networked operation scale of China’s urban rail transit, the number of vehicles has increased ...

Did you ever wonder at the silky smooth of digital curves or the sleekness of a car’s body? You were probably looking at something created by Bézier curves, even if you didn’t know it. This ...

National security, unlocked. Each Thursday, host Mary Louise Kelly and a team of NPR correspondents discuss the biggest national security news of the week. With decades of reporting from battlefields ...