Northeast Iowa kids who may be interested in a behind-the-scenes entertainment career can get some early training today in Waterloo. The Bluedorn Science Imaginarium is holding its Super Science Day, according to spokeswoman Holly Bignall.There’ll be hands-on activities and exhibits — all revolving around special effects in theatre. Bignall says the various stations offer kids a glimpse into how the magic of the imagination is coaxed along by things like sound and light. They can experiment with wind machines, pulleys that move sets and backgrounds and how lighting techniques can be used to change the mood of the audience. Bignall says there will also be a special class kids can take.Everyone in the audience will be assigned sound effects for creating the backdrop to a mock-radio play. For more information, call 319-233-8708.