by Elio — Re­ports in the me­dia of the nu­clear plant dis­as­ters in Japan of­ten cite the amount of ra­dioac­tiv­ity re­leased in units called mil­lisiev­erts. Not know­ing what a mil­lisiev­ert is, I re­sorted to Wikipedia for the needed clar­i­fi­ca­tion. We re­pro­duce some of their ex­pla­na­tion here as a pub­lic ser­vice...