5 ms·
Looking at http://en.wikipedia.org/wiki/List_of_radioactive_isotopes_by_half-life http://en.wikipedia.org/wiki/List_of_radioactive_isotopes_by..., californium-2
by edwardio 13y ago
Looking at http://en.wikipedia.org/wiki/List_of_radioactive_isotopes_by_half-life http://en.wikipedia.org/wiki/List_of_radioactive_isotopes_by..., californium-253 has a nice 17 day half-life. I propose we make this our new value of currency.