How on earth did Barbra protect her voice all her life? How did she:
1. Do three shows a night in nightclubs while...
2. Doing tv guest appearances while...
3. Recording albums while...
4. Doing 1000 performances of Funny Girl while...
5. Doing hundreds of benefit shows while...
6. Doing tv specials while...
7. Recording soundtracks for her movies while...

8. Everything else?

How does a human being still have a gorgeous voice at 68 years old? Anyone know?