Al JazeeraMédia·en·il y a 12 heures·via RSSUS tech stocks tumble as investors fret over AI spendingaljazeera.comAl Jazeera·il y a 12 heures·aljazeera.comil y a 12 heuresUS tech stocks tumble as investors fret over AI spendingTech-heavy Nasdaq falls 2.6 percent as debate rages over whether AI is a bubble.