Researchers at Maynooth University and Caltech have demonstrated a Scaffolded DNA Computer whose correct output is the system’s thermodynamically favored equilibrium. DNA strands compete to bind along a scaffold; mismatched neighboring strands carry an energetic penalty and tend to be replaced. The team ran ten programs, including parity, multiplication and the addition of two 25-bit numbers—a 100-bit computation. Open-access Nature paper, September 16
Small instances produced readable results in under a minute, and the same molecular programs could be renewed dozens of times. Scale is the sober part. The 25-position calculations could take hours, fluorescence readout remains laboratory work, and sequence energetics become harder to control as the system grows. The achievement is a physical proof that an energy landscape can perform error correction by making the right answer the comfortable place for the system to settle.