Snow White's seven dwarfs could do it. So could Andy Griffith.
Lauren Bacall told Humphrey Bogart, "You just put your lips
together and blow." They could all whistle, but astronauts on
spacewalks will never, ever be able to whistle while they work.
When you're on a spacewalk, says astronaut Jim Reilly, your
voice changes. "You can't whistle, so you'll never hear anyone
whistling on their way to work on a spacewalk. You'll hear them
humming, but you won't hear them whistling." Reilly will be one
of four astronauts performing EVAs -- short for Extra Vehicular
Activity -- on STS-117, next month's scheduled shuttle mission
to the International Space Station. Former astronaut Dan Barry
has seven hours of spacewalking time to his credit. He tried
whistling during his spacewalk on STS-96 in May 1999. "It wasn't
something I hadn't planned -- I thought of it on the fly. It
turned out that it didn't work.," he said. Barry called down to
Mission Control and said, "Houston, EV2. The science types might
like to know that