Submission + - Researchers make bottles easier to open by making them parallelograms (geek.com)
The biggest issues in lid stickiness is shape; a shirt or kitchen towel can help provide some extra grip, but a smooth circular lid is still hard to hold onto against great force. The researchers performed an ingenious series of tests with various jar shapes, from a self-reported level of difficulty to electromyographs measuring muscle use in the hands. The result? A parallelogram shape works best.