I enjoy reading about different types of science developments, so I thought we could have a thread for it. I've always found it amazing what we can accomplish as a human race. Anyway first up to bat, scientist make the first 3-D printed heart using human cells.
https://www.engadget.com/2019/04/15/tel-aviv-university-3d-printed-heart/
https://www.engadget.com/2019/04/15/tel-aviv-university-3d-printed-heart/