Determined to find out who is guiding him , he hides in the lab in wait for his secret helper .
The following morning , Pratt examines the formula on his blackboard and discovers that it is now correct .
Determined to find out who is guiding Pratt , Pratt hides in the lab in wait for Pratt 's secret helper .
The following morning , Pratt examines the formula on his blackboard and discovers that it is now correct .