trying out the hand boilers
Ira constructing a felt pocket for a thermometer.
Dr. Jacobs playing with a hand boiler.
Drop tests for "Happy/Unhappy Balls"
Getting a closer look.
Waiting for the temperature to stabilize
Ira got some help.
More "Happy/Unhappy Balls"
writing down some results
watching temperatures rise
only 3:43 left to wait