Babies Conceived During Times of Famine Are More Likely to Develop

During adolescence, when the brain undergoes a natural pruning of synapses, the brain of a person who is vulnerable to schizophrenia appears to aggressively prune away too many synapses.

People all over the world paint their bodies, but what defines whether a particular type of body art is normal or abnormal in a particular culture? If residents of the United States have visible tattoos over half of their bodies, is that normal? Is it abnormal? Explain your reasoning.