Everyone knows that the unstable, radioactive isotope, strontium-90, is the most toxic substance known to man, but not everyone knows that strontium-88 and it’s other stable isotopes are possibly the most valuable supplements one can take to ward off and even cure osteoporosis and arthritis! Or that such strontium in the form of strontium sulfate is required to assemble the fantastic spicules of the beautiful, Precambrian, Acantharia protozoan.
Our Self-Assembling Universe 