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.
\nSince 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:
Passion\n\nI've received the question about motivation to workout several times. A bit back, I emailed a fellow who simply wished the question of motivation could be answered.\n\nI think the 2 most frequently asked questions that I address in my Beginners' Guide to Fitness and Bodybuilding are:\n\n1) How do I get motivated?\n2) How soon can I expect to see results?\n\nAfter doing some research today, I think the ultimate key to motivation is:\n\nPassion\n\nYes, p-a-s-s-i-o-n\n\nWithout that burning desire to succeed, most things will elude you. Desire comes from an interest that can grow into passion.\n\nIf you have a passion for something, you'll do whatever it takes to be successful. Without it, you'll only be partly committed and only partly successful.\n\nTake a look at any major sports star or entertainer, the passion they have for their sport is obvious. It is what drives them to succeed and motivates them to give 100%. Without it, they would just be average.\n\nTo be successful in the pursuit of fitness, it needs to become a passion. So if you don't have a strong interest in becoming fit, I suggest you find other activities you do enjoy. Getting fit isn't something anybody does well as a passing interest.\n\nBut do realize that you need to know more about fitness in general before you can develop a real enthusiasm for it. In my case, as I kept learning more and more about training, nutrition and supplements, my interest really started to grow.\n\nAnd understand that you don't need to be obsessive about working out. You can be very successful just doing 45 minutes a session, 3 times a week. You don't need to live in the gym or spend every second thinking about working out.
Answer:
2