Weekly tech news roundup for August 29
What's hot in tech this week: Amazon's buying Twitch, Apple sends out invites (and may be introducing something unexpected next year), and LG is set to introduce a new (round) smartwatch. Check out one man's 3D printed, concrete, castle he built in his yard and find out the answer to how Death Valley's "sailing stones" are getting around. Want more? Read the latest internet research about whether social media makes us share our opinions or shut up about them, and find out why your voice sounds so different in your head than in a recording.
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