Meet Anna, a seventeen-year-old science star. She studies medicines to help sick people. Now she makes a new pill to replace acetaminophen (对乙酰氨基酚). Her pill works like acetaminophen but hurts livers (肝脏) less. Many people get liver problems from old pills. Anna tests her medicine carefully in her lab. She hopes her work will keep people healthier. Young minds can make big changes!