Tom Hanks's blood could be a key to defeating the coronavirus.

During an appearance on NPR's Wait Wait… Don’t Tell Me! last week, the 63-year-old actor revealed he and his wife, Rita Wilson, volunteered to donate their blood for COVID-19 vaccine development. Hanks and Wilson were some of the first celebrities to announce they had tested positive for the novel virus while working in Australia back in March. The couple returned to the states weeks after their diagnoses and have since recovered.