The document summarizes two research studies: 1) A study on the sedimentation process of cassava starch slurry in channels used by small agricultural industries in Colombia. It found that particles larger than 10 μm were efficiently retained in the first 104m, while particles between 6.7-8.8μm were discharged into water bodies. 2) A study on the relationship between age of sexual debut and sexual behaviors in Spanish adolescents. It found that those with early sexual debut (<15 years old) engaged in riskier sexual behaviors and had less consistent condom use than those with average or late debut, suggesting implications for their sexual health.