Wildly expensive and with unproven demand, venture capitalists, automakers and aerospace firms are racing for a piece of what soon may be a $1 trillion market.

Long before Silicon Valley pitches or Shark Tank deals, there was Leonardo da Vinci, an artist, scientist and part-time time ...

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Throughout his lifetime, Leonardo da Vinci designed many fantastical flying machines, self-driving carts and even a tank! Explore 3D models of these wonderful designs. In the mid-1480s ...