In his "Mathematical Curiosities" column, Mark Levi discusses a remarkable theorem discovered by Gromov.

Symplectic geometry, which traces its origins to the work of Poincaré on Hamiltonian systems, has reached a high level of abstraction.

In his recurring column on Mathematical Curiosities, Mark Levi discusses an interesting result proved by Jürgen Moser.

In his recurring column, Mark Levi presents a very short geometrical proof of the tautochronous property of the cycloid.