Wall Street rises with tech stocks; one eye on Fed

With the U.S. earnings season winding down, investors are also weighing up the prospect of an interest rate hike in the coming months. Federal Reserve Chair Janet Yellen's speech on Friday at Jackson Hole will be scrutinized for clues on the timing of a rate hike, especially after some Fed policymakers have in recent days hinted at the possibility of a hike in the near term. The meet, which includes central bankers from across the world, will start on Thursday and has traditionally been a platfo