Can resonance rods do damage to a person’s hearing?

Question: Can resonance rods do damage to a person’s hearing, especially if the demonstration is repeated several times during the day? Tanya Malusev from Arbour Scientific measured the sound intensity. The maximum value achieved was 85 db. The frequency (not...

Laser Classifications

Question: The STAO Safe on Science document (2011) indicates that only class 1 and class 2 lasers are recommended for use in high school science classes. Many of the documents that I have examined indicate that Class 3A (old classification), now called Class 3R (new...

What are restricted chemicals?

To prevent their criminal use, 10 chemicals have been identified by the Natural Resources branch responsible for compliance with the Explosives Act. They are: Hydrogen peroxide, Nitric acid, Potassium chlorate, Sodium chlorate, Potassium nitrate, Sodium nitrate,...

Biofeedback body rhythms March 9, 2024

I would appreciate some clarification on the following: i) on page 14 of 2018 Safe ON Science: “Never attempt investigations of biological feedback in which body rhythms (e.g., heartbeat or the electrical activity of the brain) are detected, amplified, and then...
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