In a recent Instagram video, Bill Gates shared a fascinating childhood story about conducting an experiment with a cow lung during his fourth-grade school days. The former Microsoft CEO is ...

Facebook page MEDspiration posted footage of an air hose being used to inflate dead sheep and cow lungs, to give an example of how rapidly the lungs expand when humans take a deep breath.

In the clip, he talks about taking a cow lung to school as a fourth grader while showing the experiments he performed on the animal organ as a kid. Bill Gates says, “So when I was in fourth ...