It's not precisely an interesting fact this week; more like an interesting set of pictures. But still cool. The British Heart Foundation ran a competition, inviting scientists to submit the best images they have of their work on heart disease, and the results are surprisingly artistic.
Medical imaging has certainly come a long way from the day that Röntgen first used x-rays to create an image of his wife's hand. She was purportedly unimpressed with his efforts, believing that the picture of her own skeleton was a herald of death - although as she lived for another 25 years, it was a herald rather ahead of its time.