Open the box
Why are cardboard boxes sometimes so hard to open? It almost became a rule that the more “easy open” writings there are on the box, the harder it is to open. There is a logical explanation for this. The cardboard is made from several layers glued together.
What doesn’t have a logical explanation is why the producers use stronger adhesive to glue the lid to the box. We end up peeling the outer cardboard layer, and the box remains closed or half-opened.