Autoimmune disorders and cancer are cruel diseases. The human body is essentially a universe of its own and there are so many things we've yet to understand about it. I'm sorry for your loss and I'm sure you'll make some great contributions!

Physics gets me stoked because of these tiny particles and fields that have huge implications across the universe and life as we know it. For example if the proton were heavier than the neutron, the whole universe would be very different. Everything relies on such a delicate balance and there's so many mysteries about physics that we've yet to uncover for instance dark matter and dark energy! Then there's quantum physics, which is notoriously hard to describe but very interesting to learn about nonetheless!