You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "who said there's no such thing as a free lunch?" whose answer is 1930s and 1940s.
Each document should contain about 30 words, and these documents should contain useful information.

Query: origin of "there's no such thing as a free lunch"
Useful Output:

Doc 1: Blue Origin mission with all-female crew, including Katy Perry, launches into space  There's No Such Thing as a Free Lunch (Milton Friedman) -
Doc 2:  There's no such thing as a free lunch,” as “attributed” to Milton Friedman. They could have cited his 1975 book by that title. And Friedman
Doc 3: In this special episode, we look at the origin and the economic philosophy behind the saying that there's no such thing as a free lunch.
Doc 4: We've all heard the phrase “there's no such thing as a free lunch,” a snarky reminder that nothing in life is free. The phrase entered the
Doc 5: There's no such thing as a free lunch. In English, this is a popular  Like many common phrases, its origin is shrouded in mystery.