Which innovative product feature was developed after its creator's daughter pointed out that touchscreens should recognize more than one finger at a time?

Throughout history, certain product innovations have fundamentally transformed industries and everyday life. Behind many groundbreaking inventions are fascinating stories of discovery, persistence, and sometimes even happy accidents. This trivia question explores a pivotal moment in product innovation history that revolutionized how we interact with technology today. Test your knowledge about the development process that led to one of the most influential technological breakthroughs of our time!

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Multi-touch technology used in the original iPhone
Palm Pilot's Graffiti handwriting recognition system
Nintendo Wii's motion-sensing controller
Microsoft Kinect's gesture recognition capability