top | item 36609805 (no title) nardi | 2 years ago The article talks about why it's maybe politically or economically difficult, but not why it's physically difficult. discuss order hn newest 101011|2 years ago Subtracting economics from the equation, aren't there a very limited number of physically difficult problems?
101011|2 years ago Subtracting economics from the equation, aren't there a very limited number of physically difficult problems?
101011|2 years ago