Sound
- Episode aired May 7, 2012
Professor Knowitall explores sound with Dr Spark and Dr Bright.Professor Knowitall explores sound with Dr Spark and Dr Bright.Professor Knowitall explores sound with Dr Spark and Dr Bright.
Professor Knowitall explores sound with Dr Spark and Dr Bright.Professor Knowitall explores sound with Dr Spark and Dr Bright.Professor Knowitall explores sound with Dr Spark and Dr Bright.