Because of there strong bodies and immune systems athletes are not affected by air pollution when exercising

[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.

Um yea this might be weird to say up here but me and my girl got freaky and shoved a bottle up my but thole and now is stuck. so what do i do?

What kind of wound occurred when the skin scrapes against a hard surface and tiny blood vessels break in the outer layer of skin