A lot of personal flying machines are in the works right now, but this one from Washington-based startup Zeva Aero surely features one of the most extraordinary designs yet. The Zeva Zero aircraft ...

In the 1480s, Italian Renaissance artist and inventor Leonardo da Vinci came up with an ingenious design for an “aerial screw.” A rotor in the shape of a helix measuring about 13 feet in diameter, the ...

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...