Catégorie : Echange

• Radio.

• Radar.

• Railroads.

• Rocket.

• Submarine.

• Steam Engine.

• Telephone.

• Turbine.

• Television.

• Windmill.

• Shingles.

• Smoking.

• Stem Cell.

• Stroke.

• Tuberculosis.

• Surgery.

• Vitamin.

• Dentistry.

• Depression (psychology).

• Exercise.