Isotonitazene, nicknamed "iso fentanyl," is a synthetic opioid more potent than fentanyl that evades standard drug tests and complicates overdose treatment.
Para athletics is track and field for athletes with physical, visual, or intellectual impairments. Learn how classification works and which events are contested.
Interaction effects occur when two variables combine to produce an outcome neither would cause alone. Here's what that means and why it matters in research.