Methuselah, a venerable bristlecone pine believed to be nearly five millennia old, grows in Californias White Mountains. This extraordinary tree offers invaluable insights into the past, while its exact location is kept secret to protect it from potential harm. Researchers study the growth rings of bristlecone pines to reconstruct climate history and improve dating techniques. However, Methuselah and other ancient bristlecone pines now face new challenges as environmental conditions continue to change.