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A swirling circle illusion is taking Reddit by storm, leaving thousands debating over what number is actually hidden inside.

This viral F1 brain teaser challenges you to spot three hidden flags in just 13 seconds - can you find the yellow, red, and chequered flags before time runs out?

In previous versions of Microsoft Outlook (the classic app), you could view the HTML code of an email by opening the email, right-clicking on it, and selecting “View source” from the context menu.