Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cosmic Ray Extremely Distributed Observatory: Status and perspectives of
  a global cosmic ray detection framework   The Cosmic-Ray Extremely Distributed Observatory (CREDO) is a project
dedicated to global studies of extremely extended cosmic-ray phenomena, the
cosmic-ray ensembles (CRE), beyond the capabilities of existing detectors and
observatories. Up to date cosmic-ray research has been focused on detecting
single air showers, while the search for ensembles of cosmic-rays, which may
spread over a significant fraction of the Earth, is a scientific terra
incognita. The key idea of CREDO is to combine existing cosmic-ray detectors
(large professional arrays, educational instruments, individual detectors, such
as smartphones, etc.) into a worldwide network, thus enabling a global
analysis. The second goal of CREDO involves a large number of participants
(citizen science!), assuring the geographical spread of the detectors and
managing manpower necessary to deal with vast amount of data to search for
evidence for cosmic-ray ensembles. In this paper the status and perspectives of
the project are presented.

1
The categories of this paper are: cs
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
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The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th