The bamboo-copter was originally conceived by the engineer of what nationality?
Bamboo-copter:  This helicopter-like top originated in Warring States period China around 400 BCE, and was the object of early experiments by George Cayley, the inventor of modern aeronautics. George Cayley: Sir George Cayley, 6th Baronet (27 December 1773 – 15 December 1857) was a prolific English engineer and is one of the most important people in the history of aeronautics.
English