Scientists engineered a special enzyme called TcsAB to work better at cold temperatures, enabling it to break down triclosan, a harmful antibacterial chemical that pollutes our water. By using computer simulations and strategic mutations, they created a modified enzyme that degrades triclosan 2.5 times more efficiently at 15°C. When inserted into bacteria, this engineered enzyme helps clean up triclosan pollution in natural environments without requiring energy-intensive heating.