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Top 100 Gadgets That Changed the World
science-fiction. 49. Fitbit (2009) Mechanical pedometers have been in existence for a few centuries; Leonardo da Vinci envisioned them. The Fitbit Tracker, the company’s first device, was released in 2009 and
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101 Best Inventions Ideas of All-Time & Innovations that Changed the World’s History
barely visible, and are the culmination of centuries of optical precision. Theoretically designed by Leonardo da Vinci in 1508, contact lenses were not possible until the 20th century, when material breakthroughs