Bananas are an awesome source of potassium and other vitamins, but they aren't everyone's favorite lunchtime treat. Inscribing the skins (without any markers or pens!) and magically pre-slicing them before packing them up alongside the peanut butter and jelly helps ensure that they'll get eaten, and that they'll make someone feel extra special.
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1Nerdy Note: How does it work? Banana peels can be used to help make bruises fade more quickly, but they also get bruised pretty easily. Keeping bananas in a cold place (like the freezer if you're getting ready to make banana bread) results in "chilling injury" and can make them brown up, but so can getting bumped around. By writing on the surface of the peel, you're actually damaging some of the cells, which then turn brown (also called "skin abrasions").
2The best way to open a banana is just how chimpanzees and other non-human primates do - from the stubby end instead of the long-stemmed end. Give it a shot!