Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Four Big Questions with Pretty Good Answers   I discuss four big questions that can be importantly addressed using concepts
from modern QCD. They concern the origin of mass, the feebleness of gravity,
the uniqueness of physical laws, and the fate of matter when it is squeezed
very hard.

36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat