303408
He wrote a number of books about popular science and history , and for many years he was part of the staff of Dagens Nyheter , where he published short poems about current events or other topics .
 Dagens Nyheter
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Dagens Nyheter