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How many real friends can one person really have? This article explores Dunbar's Number and the theory that there's a limit to the number of meaningful friendships a person can maintain. via Nautilus.

Rachel Botsman, an expert on the collaborative economy, explores how online reputation systems, where users rate each other, impact behavior in her article, "The Changing Rules of Trust in the Digital Age." via The source of this content is Harvard Business Review.

This comic explores the idea of questioning common health advice, ending with a humorous suggestion about overthinking's origins. via xkcd.com

This recipe from The Kitchn describes how to make a buttermilk substitute with milk and lemon juice or white vinegar.

The cost of getting consumers' attention through advertising has skyrocketed since 1990, increasing seven to nine times in real terms. via The source of this content is Harvard Business Review.

Valet Magazine shares some life lessons from foodie explorer Anthony Bourdain.

via Valet

Bob Odenkirk and David Cross are back with a new sketch comedy series, "With Bob and David," premiering on Netflix November 13th - you can watch the trailer for the new series now. via Consequence.

Mental Floss takes a look at the surprising history of tattoos, from ancient royalty to beloved celebrities. Learn about 10 historical figures, including U.S. presidents and famous authors, who sported some ink.

Learn about the untold story behind the Myers-Briggs personality test and its creator, Isabel Myers Briggs, in this article from Longform.

via Longform

Harvard Business Review offers advice from Susan Cain on how introverts can make the most of conferences. via The source of this content is Harvard Business Review.

This HBR article examines how Tesla, Under Armour, and Sonos leverage technology to build strong online communities around their brands. via The source of this content is Harvard Business Review.

Quartz published four recipes from "Good and Cheap," a cookbook with budget-friendly meals costing less than $2 per serving. You can find a link to download the entire cookbook for free within the article.