Mr. Gondry's use of nonprofessional actors makes sense when exploring parts of the city that more often are exploited or ignored at the cinema.

WSJ: A Bronx Tale Unlike the One Hollywood Tells

Filming on location with nonprofessional actors drawn from locals along the Ohio-West Virginia border, Steven Soderbergh revitalizes the eternal triangle with a low-key yet ravishing homespun neorealism.

NEWYORKER: Bubble

Nonprofessional options investors can be divided roughly into three groups.

FORBES: Magazine Article

Experiments measured the forces and acceleration of a regulation, adult-size-5 ball propelled repeatedly at a magnesium dummy-like head at 18 meters per second, which is considered the average speed a ball is kicked by nonprofessional players.

WSJ: Soccer 'Header' Impact Likened to Hard Punch