This week on Dear Science, Allan takes us through a whirlwind of science, touching on nobel prize winners, potential cancer-causing drugs and lead in London air from petrol.

Allan takes on a journey of the careers of Ei-ichi Negishi and Richard R. Ernst, both shemists who have contributed to the scientific world.

James learns about a scientific paper which said a drug called ranitidine created carcinogens in patients, which has now been retracted.

Allan warns us of the impacts of lead in the air and explains why there is still lead in the air from when petrol contained lead.