TEACHER ON CAMERA WITH COSBY.(CAPITAL REGION)

Byline: BECHETTA JACKSON Staff writer

A sticker on the front of Cohoes High School teacher Maria Russo's desk reads: ``Science teachers make a world of difference.''

Russo is trying to do her part.

She recently taped a 30-second public service TV spot in New York City with actor Bill Cosby, 13 students and adults from seven states. Russo, who has taught at the school for 20 years, was the only teacher selected for the TV ad. It emphasizes the importance of integrating workplace skills into the school curriculum and will air throughout the state later this year.

Russo was picked for the project by a representative of the state School to …