The Wall Street Journal China’s Answer to Nvidia Soars 425% in Market Debut — AI chip maker Moore Threads—founded by a former Nvidia executive—surged in its first day of trading after a $1 billion-plus IPO. Alarm Over Hypersonic Missile Gap Fuels Startup Boom — With $350 million in new funding, Castelion is among the companies racing to make the U.S. competitive with Russia and China in Mach 5 warfare. Chinese Forces Battle Dizzying Altitudes to Expand Military Footprint —