how do you open a can of resin?
A lot depends on what kind of cancer cells. However, the cells themselves are not generally a risk. Even if you injected cancer cells into your body, they'd be VERY unlikely to form a tumor. Your immune system would recongize them as unrelated to you and quickly kill them. However, there can be risk from viruses or other pathogens that may be in the culture with the cancer cells. This is especially true for primary cells - cancer cells derived directly from a patient's tumor. If the patient was infected with HIV, HBV, HCV, etc., those viruses could also be present in the culture, and could infect the technician if proper procedures weren't followed. Proper procedures normally include handling cells inside a laminar flow biological safety cabinet, wearing gloves, lab coat, and protective glasses/goggles, disposing of waste in proper biohazard containers, etc. If a culture is known to contain a dangerous virus, then increased safety procedures are often required.
Smoke detectors can respond to either smoke or heat from a fire. In your case it is responding to a cloud (steam) that it confuses with smoke. This is a case where it is better to be safe than sorry. I would rather have a false alarm than no alarm to smoke that can kill you when your sleeping. Few detectors are combination smoke and carbon monoxide detectors. They used to be seperate. And as the demand and need (my city requires them by code) rises so will the production of combination detectors. Carbon monoxide detectors monitor only the carbon monoxide in the air and alarm only when it is at dangerous levels. Ours keeps a running count of the level in the air.
