Which product's design was directly inspired by observing nature?

Some of the world's most iconic products were designed with unexpected inspirations or pivoted significantly from their original purpose. This trivia tests your knowledge about the fascinating design origins behind everyday items we take for granted. Can you identify which product's design story is authentic?

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Velcro, created after Swiss engineer George de Mestral noticed how burdock burrs stuck to his dog's fur
Post-it Notes, designed after researchers studied how gecko feet adhere to surfaces
Bubble Wrap, invented after engineers analyzed how air bubbles in tree bark protect against temperature changes
The Swiffer, developed after scientists studied how lotus leaves naturally repel water and dirt