227361
Low-power electrostatic motors and toys can be driven from this collected sky voltage when one side is connected to earth ground , and the other is connected to the sky collector , such as a kite or balloon with a foil collector and fine wire running down to the ground .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None