AP

CHICAGO — Scientist Mary Rodgers spends her days tracking killers — elusive, constantly mutating viruses that travel the globe and are responsible for illness or death in millions of people.

AP

PHILADELPHIA — For an assignment at Bala Cynwyd Middle School when he was 11 years old, Michael Schiller wrote a 15-page autobiography. He devoted one page to his “changing point” at age 6.

AP

The first attempt in the United States to use a gene editing tool called CRISPR against cancer seems safe in the three patients who have had it so far, but it's too soon to know if it will improve survival, doctors reported Wednesday.