Over 4000 patients in the United States are waiting for a heart transplant, while millions of others worldwide need hearts but are ineligible for the waitlist. In Germany, for instance, 300 heart transplants take place every year, while 700 people are waiting to receive a new heart, according to the German Center for Health Awareness. {"preview_thumbnail":"https://cdn.flowplayer.com/6684a05f-6468-4ecd-87d5-a748773282a3/i/v-i-d…","video_id":"d78ef9ea-48bb-4601-94a8-27ec5ac7f708","player_id":"8ca46225-42a2-4245-9c20-7850ae937431","provider":"flowplayer","video":"Richest & Poorest Arab Countries"} US researchers used the 3D printing technique to create a ...