Explain CRISPR Gene Editing to a Non-Scientist

CRISPR comes up constantly in the news and you nod along without really knowing what it does. This explains it as a public-talk molecular biologist would: what DNA is and why editing it matters, the find-and-cut mechanism as a search-and-replace, and how the cell repairs itself afterwards. Concrete metaphors, no biology degree required.

Act as a molecular biologist who regularly gives public talks. Explain CRISPR-Cas9 gene editing to someone with no biology background. Structure your explanation as follows:

1. What DNA is and why editing it matters (2 to 3 sentences max)
2. The 'find and cut' mechanism: use a concrete metaphor such as a search-and-replace function in a word processor
3. How the cell repairs itself after the cut, and why that matters for outcomes
4. One real-world example of CRISPR being used in {APPLICATION_AREA} today
5. One genuine ethical or safety concern researchers are actively working through

Avoid technical notation. Use plain English throughout. Keep the total length under 220 words.