Summary:

- Scientists have discovered evidence of an extinct genetic code that predates DNA and RNA, the two main forms of genetic material found in all known life on Earth.
- This hypothetical "pre-RNA world" would have used a different type of genetic molecule that could have served as a precursor to the modern genetic systems we know today.
- The findings provide insights into the early evolution of life on Earth and the potential for alternative biochemistries that could exist on other planets, expanding our understanding of the origins of life.