FILE - In this Sept. 8, 1974, file photo, Evel Knievel sits in the steam-powered rocket motorcycle that will hopefully take him across Snake River Canyon in Twin Falls, Idaho. A company with the ...

FILE - In this Sept. 8, 1974, file photo, Evel Knievel sits in the steam powered rocket motorcycle that will hopefully take him across Snake River Canyon in Twin Falls, Idaho.

FILE - In this Sept. 8, 1974, file photo, Evel Knievel sits in the steam-powered rocket motorcycle that will hopefully take him across Snake River Canyon in Twin Falls, Idaho.

In this Sept. 8, 1974, file photo, Evel Knievel sits in the steam-powered rocket motorcycle that was supposed to take him across Snake River Canyon in Twin Falls, Idaho.

Photo shows Louise Brown, the one-year-old test-tube baby born in England last year, responds to studio audience during taping of Phil Donahue show in Chicago, on Friday, Sept. 8, 1979.

As a boy, Robbie Knievel began on his bicycle to emulate his famous father. Stunt performers Evel Knievel with his son Robbie Knievel circa 1980's. (Photo by Mark Weiss/WireImage) ...

In this May 25, 1975, file photo, Evel Knievel approaches the landing ramp with his motorcycle during his unsuccessful effort to leap over 13 busses spanning 140-feet at 100 miles per hour in London.

FILE - In this Sept. 8, 1974, file photo, Evel Knievel sits in the steam-powered rocket motorcycle that will hopefully take him across Snake River Canyon in Twin Falls, Idaho.