I seriously doubt that I'm the only person who believes SCIENCE!
Here are my top contenders.
E=MC2. If this is true, the matter exists in another state, a state of energy. In my mind this goes a long way to explaining "potential" energy. I have long viewed "potential" energy as a crock of fertilizer that SCIENCE!
Neutron star. I suppose this qualifies as a solid, but does it really? From what SCIENCE!
Black Hole. We now know (
Light. Light is a wave and a particle. Light also does a lot more stuff that boggles science. If it is a particle, then it is a substance. Being a substance, what state of matter is it?