Is this cat going up or down the stairs?
This innocent photo of a cat went viral back in 2015 as people wondered whether the animal was going up or down the flight of stairs.
Internet users used everything from architecture to biology to defend their answers to the hotly debated question. INSIDER's Megan Willett, for example, broke down why the cat is "definitely" going down the stairs — and after reading her explanation on Business Insider, I'm convinced.