59670
It was demonstrated experimentally ( R. W. Wood , 1909 ) that a ( not heated ) " greenhouse " with a cover of rock salt ( which is transparent to infrared ) heats up an enclosure similarly to one with a glass cover .
 R. W. Wood
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 R. W. Wood