Did you ever wonder how many grains of sand were on a beach? Or perhaps the simpler question of how many grains of sand fit into a 20 ml collecting vial like the one in the cover photo? I imagine you probably have not, but I did.
Did you ever wonder how many grains of sand were on a beach? Or perhaps the simpler question of how many grains of sand fit into a 20 ml collecting vial like the one in the cover photo? I imagine you probably have not, but I did.