Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Subatomic Physics-100 Not Out and Still Going Strong!   On the occasion of the birth centenary of the discovery of electron, I
discuss its role in the area of Elementary Particle Physics. I emphasize that
the discovery of electron marks the end of the speculation era lasting more
than 2500 years. The key developments leading to the discovery of electron by
J.J. Thomson are mentioned. The standard model is briefly described. It is
emphasized that this model is unsatisfactory in several respects, however no
further progress beyond standard model is possible unless there is a dramatic
advance in instrumentation.

19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org