Misc: what body of water does the danube river flow into?

Questions

What was Cheyenne's last name?

What was the sport of brothers Max and Buddy Baer?

Fifty-two-year-old Jim Fixx, author of "The Complete Book of Running"?

Who recorded "I Don't Know Why But I Do" in 1961?

Who played Helen Keller in the 1962 film "The Miracle Worker"?