Sid wonders how he can lift his heavy box of toys way up to his treehouse. After investigating at school, Sid discovers that a pulley is the perfect simple machine to help lift heavy things up to high places, like a tree house!
In connection with The Story of the Jews, WNET Education is launching an essay contest for high school aged students to examine how stories shape our identities.
Meet some extraordinary women in Vermont.
Tons of videos and games for children from PBS!