A special event was held to celebrate his 100th birthday anniversary.

The chemistry class is very difficult.

He is interested in the history of the Old World.

A regular polyhedron is a polyhedron where all faces are the same shape and all vertices are the same shape.

My younger brother goes to a school for special needs.

My younger brother attends a class for special needs.

Mercury is a harmful element for the body.

Her hair was shining in silver.

Mercury is a metal that is liquid at room temperature.

He is looking for a silver bullet to solve the problem.