You should now be more aware of what your community can do to help families prepare for a natural disaster. Go back to your community's website and look at the information it provides on the natural disasters in your area. Read the information thoroughly. Are some parts better than others? How could the community do a better job preparing its citizens? Select a natural disaster that you think needs better information on disaster preparedness. Which natural disaster did you select?

[120 total points] (public health) in one of the largest human experiments ever conducted, in 1954 a randomized controlled trial was run to see whether a vaccine developed by a doctor named jonas salk was effective in preventing paralytic polio. a total of 401,974 children (ages 6–9), chosen to be representative of those who might be susceptible to the disease, were randomized to two groups: 200,745 children (the control group c) were injected with a harmless saline solution (a placebo) and the other 201,229 children (the treatment group t) were injected with salk’s vaccine.what was the point of giving saline solution to the children who didn’t get the vaccine? explain briefly.