Go to your local photo lab and ask for one of the cans their bulk 35mm
film comes in. They are about 1.5" tall and 4" in diameter. Some type of
tinned steel. If you are into making something really small you may be
able to find one of the metal cans with screw on lid that the single rolls
of 35mm film comes in.
The positronium atom has a diameter the same as hydrogen, but its Bohr
radius is two times that of hydrogen.
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