Compound four tetrahedra

Art. Lebedev Studio has...

Summer is the time that you want to spend outdoors. Children will sit at the desk in September,...

(challenging task called “a star”)

What happens if a flat geometric shape, such as a rectangle, begins to rotate rapidly relative to...

Stamps cover all significant events happening in the world. Much attention was paid to polyhedra...

The article in “Science and Life” (1989, №6, Cherenkov A. Khramov V.) tells about an interesting...

  There are coincidences, which we do not even suspect. April 12 - Cosmonautics Day!...