You are given a passage. Using the information present in the passage, you need to classify it into one of the 10 topics: 0 - 'Society & Culture', 1 - 'Science & Mathematics', 2 - 'Health', 3 - 'Education & Reference', 4 - 'Computers & Internet', 5 - 'Sports', 6 - 'Business & Finance', 7 - 'Entertainment & Music', 8 - 'Family & Relationships', 9 - 'Politics & Government'.

Let me give you an example: Optical mice use an LED and a camera to rapidly
capture images of the surface beneath the mouse.
The infomation from the camera is analyzed by a
DSP (Digital Signal Processor) and used to detect
imperfections in the underlying surface and
determine motion. Some materials, such as glass,
mirrors or other very shiny, uniform surfaces
interfere with the ability of the DSP to
accurately analyze the surface beneath the mouse.

Since glass is transparent and very uniform, the
mouse is unable to pick up enough imperfections in
the underlying surface to determine motion.
Mirrored surfaces are also a problem, since they
constantly reflect back the same image, causing
the DSP not to recognize motion properly. When the
system is unable to see surface changes associated
with movement, the mouse will not work properly.
The answer to this example can be: 4
Here is why: The passage talks about optical mice or mouse throughout which is a part of computer system. Thus, it is correctly classified to "Computers & Internet"

OK. solve this:
Hanukkah, the Festival of Lights, is one of the most joyous times of the Jewish year.

The reason for the celebration is twofold (both dating back to c. 165 BCE):

the miraculous military victory of the small, ill-equipped Jewish army over the ruling Greek Syrians, who had banned the Jewish religion and desecrated the Temple;

and the miracle of the small cruse of consecrated oil, which burned for eight days in the Temple's menorah instead of just one.

Hanukkah is celebrated by:

a. lighting a menorah for eight nights with olive oil or wax candles; one on the first night and an additional one each succeeding night

b. eating food fried in oil, especially potato pancakes (latkes) and jelly doughnuts (sufganiyot)

c. playing with a dreidel, a four-sided top; the player wins or loses money depending on which side it lands on (each is marked with a different Hebrew letter)

In 1997, a 60-foot, 18-ton menorah was built in Latrun, Israel; a rabbi was lifted by crane each night to kindle the lights. The same year, a 12-foot pyramid of 2,400 jelly doughnuts was built near Afula, Israel; the pastries were later distributed to soldiers serving near the northern border.

Hanukkah began this year (2005) on the evening of December 25.

See poster:
http://www.allposters.com/-sp/Menorah-w-toys-candy-and-gifts-in-background-Posters_i1459268_.htm
Answer:
3