TLDR: Take an extra 20 percent off these already heavily discounted gadgets as part of the 10.10 Shopping Day deals. If you thought Black Friday was the world’s biggest shopping day, then you’re only focused on North America. Because when you take the entire globe into consideration, the single biggest shopping day of the year is actually China’s Singles Day on Nov. 11.  Ecommerce giant Alibaba jumpstarted the holiday about a decade ago, turning it into a juggernaut that generated over $38 billion last year, 2.5 times more than Black Friday and Cyber Monday combined. Now, American retailers already reeling…

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