THIS DAY IN SCIENCE: DNA double helix in 1953

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Safety Q and A: Radioactivity


I am concerned about the proposed inclusion of a lab investigation in the new SPH4U course involving the study of radioactive half life, using Cesium-137 as a source. Are there provincial regulations about the use of radioisotopes in high school science labs? If not,... read more

Safety Q and A: Lab Ventilation


The Occupational Health and Safety Act (Reg.851 Section 127) requires that facilities ‘shall be adequately ventilated by either natural or mechanical means such that the atmosphere does not endanger the health and safety of workers.’ What constitutes... read more

Safety Q & A: Methylene Blue


What level of exposure to methylene blue is harmful to students/teachers with G6PD deficiency? I’ve used this substance as a biological stain for more than twenty five years, but it wasn’t until this September, when a colleague had a student with this... read more
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