7143415 5c23ad5c15ee4d22c163f180a0e9a0e5 chemicalguy http://gravatar.com/chemicalguy chemicalguy http://0.gravatar.com/avatar/5c23ad5c15ee4d22c163f180a0e9a0e5 http://0.gravatar.com/avatar/5c23ad5c15ee4d22c163f180a0e9a0e5 thumbnail Robert Mitchell Robert Mitchell chemicalguy I'm a former research scientist, lecturer, examiner and chemistry & biology tutor. I now write A-level chemistry and biology text books full time to fill the current gaps in the market. Bolton chemistryworkshops@googlemail.com true