Infants as young as 6 months can distinguish between arrays of 8 versus 16 dots but not between 8 versus 12 dots, indicating the use of which of these core knowledge systems?

Ijust want the meaning to life (no wrong or right answers i just want your true opinion)

Sally goes jogging every morning she also enjoys playing tennis and baseball identify the lifestyle that sally maintains

[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.