And read the answers here

Only 2% of all scissors manufactured are left-handed scissors

"McCartney found right-handed guitars difficult to play, but when he saw a poster advertising a Slim Whitman concert, he realized that Whitman played left-handed with his guitar strung the opposite way to a right-handed player."

Reference: http://en.wikipedia.org/wiki/Paul_McCartney

Statistically, yes...

but there is no scientific proof that handedness is a relevant factor.

"Men are slightly more likely than women to be left-handed. No one knows why, but a popular theory suggests that it has to do with an effect of testosterone on the developing brain."

Reference: http://www.drspock.com/article/0,1510,5815,00.html

Yes and no...

Lefties are forced to work with tools developed for right handed people, so they may appear to be awkward or clumsy. Generally, when given the appropriate tools, left handed people have an agility advantage because this functionality is managed by the right hemisphere of the brain (recent studies show that lefties use both hemispheres equally)

...All but one: Ronald Regan, George Bush, Bill Clinton, and Barack Obama are all left handed. George W Bush is the only right handed president of the group.

Reference: http://www.lefthandersday.com/tour6.html

Yes!

...In fact, four of the five original developers of the Macintosh computer where left handed.

Reference: http://www.lefthandersday.com/tour6.html