What is your research question? (How has light become an instrument to treat cancer and other diseases)

Examples of how you should phrase your research question: (Your question must be phrased in this style.)
How has the role of [topic] changed over the past 50 years?
What are the effects of [topic] on [topic]?
How did the [topic] impact the lives of [topic] in the [topic]?
How has [topic] changed over the past century, and what has influenced those changes?
Bad: How does social media affect people's behavior? (This is not specific enough.)
Good: What effect does the daily use of YouTube have on the attention span of children aged under 16? Make it under 15 words

1 answer

How has light therapy evolved as a treatment for cancer and other diseases?