Diwali, the Festival of Light, marks different events depending on where it is celebrated. In some areas of India, it marks the return of Lord Rama to his birthplace of Ayodhya after defeating the demon Ravana. For Vivek Subbiah, associate professor at the Department of Investigational Cancer Therapeutics, Division of Cancer Medicine of the MD Anderson Cancer Center, the story of how Rama defeated Ravana has parallels in drug discovery. Ravana had 10 heads, and when one was cut off, it grew back. Rama defeated Ravana by means of a magic arrow that entered through the demon’s navel.