Bionics aims to transpose solutions from nature into technical applications. There are two main methods: analog bionics which finds natural analogies like wing tips, and abstractive bionics which identifies principles from biology like water repellent surfaces. Bionics is useful for prosthetics, with over 185,000 Americans needing limb replacements annually. It also aids in energy problems by mimicking photosynthesis, miniaturization by creating biological transistors, and aids disabled individuals like Stephen Hawking and Oscar Pistorius. The term bionics was coined in 1958 but nature-inspired inventions date back to designs by Leonardo Da Vinci.