Let's say you just invented the first universal solvent! What would you keep it in? how would your mythical storage device store it?
There are a few options. Few of them are vacuum, a black hole, anti-matter box, etc.
Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
For controlled fusion they use magnetic fields to keep the plasma away from the sides of the container.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.