how about the billion pieces of silica ?
How about the billion pieces of silicates we ingest every year, or the billion pieces of NaCl we inhale every day when going to the sea side, or the billion pieces of various organic fibers etc. ?
How about the billion pieces of silicates we ingest every year, or the billion pieces of NaCl we inhale every day when going to the sea side, or the billion pieces of various organic fibers etc. ?