3 INVENTIONS THAT CHANGED THE WORLD:


1.The condom: was invented in 1640 the first that recommended its use to prevent the spread of diseases.



2. The pacemaker: inventing in 1958. Not long ago having an irreversible heart defect involved certain death.



3. The toothbrush: inventing in 1498. An unknown Chinese was the first to mount bristles on a piece of wood. These bristles came from pigs and were mounted on bamboo or a fragment of bone.