The scientists have discovered that the adolescent brain does more than prune old connections. During the teen years, it actively builds dense new clusters of synapses in specific parts of neurons.
The researchers reported measuring metabolite concentrations of two commonly used herbicides -- glyphosate and 2,4-dichlorophenoxyacetic acid (2,4-D) -- as well as the insect-repellent DEET in urine samples collected in 2016 from 519 adolescents aged 11 to 17, living in the agricultural coun