The original version of this story appeared in Quanta Magazine. “Obviously” is a dangerous word, even in scenarios that seem simple. Suppose, for instance, you need to do an important computation.

GUEST OPINION: Browser add-ons are a necessary component of Internet life. More than 60% of users rely on them for productivity, entertainment, and security. They make your browsing better.

"By adding dozens of fuel and convenience stations this year, we are bringing even more value to our customers," Walmart U.S. Vice President of Fuel and Convenience Dave DeSerio said in a statement.

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