One contribution that bioengineers have made over the past few decades is the artificial pacemaker. I wish I was part of the team that developed this machine. The heart is such a central part of the body and basically decides whether you are alive or dead. You can live with one kidney but you can’t live without a heart. So the invention of an artificial pacemaker allowed for longer and better lives for so many. The artificial lung is another device that has helped so many. Both devices allowed so many to live by creating artificial copies of much-needed body parts. 
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