You know, if for some reason, I was reborn and retained my memory, material science would be a career I'd like to try. I worked on a research project with an advisor that was a material sciences professor, and he always talked about working on the coolest stuff.
Material science is a field where you can improve any physical process with new materials.
Let's say you want to make a better battery. Where do you start? Maybe you look at different metals and how they react with acids. Maybe someone needs to make a new metal alloy (blend of metals) to maximize the energy storage while also taking into account of the availability of the metals and packaging.
Or maybe you want to help save the environment from waste. It'd be amazing if someone could create a material that is ultra light, cheap, impact-absorbing, while also being super easy to recycle (or self-decomposes, or, even crazier, edible).
Or maybe you care about fashion. What if you could create a fabric which changes colors based on an interaction with a gas/liquid, or maybe temperature? What if you could make the softest material that human beings could ever feel, but at the same time, cats hate to scratch it? Or maybe even a material that can wash/clean itself without water?
All these improvements are what material science engineers work on. These engineers have been around since the beginning of civilization, creating iron weapons that displaced those that only used bronze. And these engineers will continue to be around searching for the best materials to use for the challenges that lay ahead for all of us. This is why I think material sciences is a super exciting subject. :)