He cooked using a gas stove.

I will participate in an obstacle race this weekend.

The biker gang is causing a commotion in the town.

The thirteenth day of the month is my birthday.

Crux is one of the constellations in the southern hemisphere.

He gripped the control stick and piloted the plane.

The 24-cell is one of the convex regular polytopes in four dimensions.

He found a regular dodecahedron-shaped spicy cod roe.

He made a model of a regular icosahedron.

Heavy hydrogen is one of the isotopes of hydrogen.