Mucosal immunity plays a crucial role in protecting our bodies from pathogens.

This regular dodecahedron is a geometric shape with perfect symmetry.

He made a model of a regular dodecahedron.

He made a model of a regular icosahedron.

This solid is called a regular icosahedron, and it is made up of 20 equilateral triangles.

Memphis is an ancient city in Egypt.

I got my license suspended for speeding.

He conducted an experiment using a spherical lens.

The calculation of the spherical angle is a part of geometry.

Cotton fabric is very soft and comfortable.