Stephen Hawking speaking without the use of his voice synthesizer, 1970's. https://t.co/GurB07iM2j https://video.twimg.com/amplify_video/1777785954427654144/vid/avc1/906x588/l3qA93adsemGE_Dk.mp4?tag=14
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Stephen Hawking speaking without the use of his voice synthesizer, 1970's. https://t.co/GurB07iM2j https://video.twimg.com/amplify_video/1777785954427654144/vid/avc1/906x588/l3qA93adsemGE_Dk.mp4?tag=14
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