Why Do Raspberries And Blueberries Have Black Sheets Under Them, But Not Strawberries Or Grapes?

It’s amazing how much of everyday life I didn’t question for years – like what “wi-fi” really means, where we get paprika from, and what ASDA actually stands for. 

And opening my fridge this afternoon, another banal mystery confronted me. What’s that squidgy black mat at the bottom of raspberry trays for, and why isn’t it in the bottom of my strawberry tray?

It seems I’m not alone. Posting to r/NoStupidQuestions, Redditor u/GrumpyOldSophon asked about the addition, wondering why you...