Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A proposal to fight tornadoes with multiple connected balloons   A tornado is an extreme weather condition that can cause enormous damage to
human society. In this paper, we propose a low cost, environmentally friendly
method to fight against tornadoes using clusters of connected balloons.
Deployed over a sufficiently wide area, these large balloons may be able to
reduce the wind speed of the tornado, block and disrupt the convective flow of
air, and destroy the tornado.

6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org