Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Black Holes, Entropy, and Information   Black holes are a continuing source of mystery. Although their classical
properties have been understood since the 1970's, their quantum properties
raise some of the deepest questions in theoretical physics. Some of these
questions have recently been answered using string theory. I will review these
fundamental questions, and the aspects of string theory needed to answer them.
I will then explain the recent developments and new insights into black holes
that they provide. Some remaining puzzles are mentioned in the conclusion.

8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
19
The categories of this paper are: eess