Nvidia's stock skyrockets, propelling it back into top holdings.
US debt concerns rise as Fitch puts rating on negative watch.
Federal Reserve faces uncertainty in future policy decisions.
Snowflake disappoints with revenue projections, stock drops.
Chinese hacking group poses cyber threats to critical infrastructure.
Nvidia's success boosts investor optimism.
US debt ceiling debate raises potential credit rating downgrade.
US debt ceiling debate raises potential credit rating downgrade.
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