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Palmer Luckey launched his first tech company as a teenager. He sold it to Facebook for $2 billion. Now he's making AI weapons the Pentagon is buying for itself and also sending to Ukraine.

Tech companies are pouring billions into AI chips and data centers. Increasingly, they are relying on debt and risky tactics. Financial analysts are worried there's a bubble that will soon pop.

Alberto Castañeda Mondragón was hospitalized with eight skull fractures and five life-threatening brain hemorrhages. Officers claimed he ran into a wall, but medical staff doubted that account.

The annual contest for students in grades four through 12 is back for its eighth year — this time with a special prize for a podcast that marks the 250th anniversary of the United States.

Several factors help determine whether a given earthquake will generate a dangerous tsunami, but the process is not yet fully understood.