Dear Matthew Alice: How do they get the lead into a wood pencil? And how come we don’t get lead poisoning as children by doing all that schoolwork in pencil? — J.H., El Cajon Where …
February 11, 1993
Posted February 11, 1993
Dear Matthew Alice: How do they get the lead into a wood pencil? And how come we don’t get lead poisoning as children by doing all that schoolwork in pencil? — J.H., El Cajon Where …