1. Science

2. How Do Ears Work?  10 steps of how ears work.

3. Cause of Hearing Loss

4. How this cause actually cause hearing loss?

5. How does hearing aids help people hear?

6. Economic issue  Cost of Hearing aid of children and adults.  And Why children’s hearing aids are so expensive?  What is hearing loss related with economic issue?

7. Bibliography(research)  "What's Hearing Loss?." KidsHealth - the Web's most visited site about children's health. N.p., n.d. Web. 15 Feb. 2012. <http://kidshealth.org/kid/health_problems/sight/hea ring_impairment.html#  "Hearing Impairment." KidsHealth - the Web's most visited site about children's health. N.p., n.d. Web. 15 Feb. 2012. <http://kidshealth.org/teen/diseases_conditions/sight /hearing_impairment.html  "Hearing Aid Costs - Consumer Reports Health." Consumer Reports: Expert product reviews and product Ratings from our test labs. N.p., n.d. Web. 16 Feb. 2012. http://www.consumerrepots.org/health/healthy- living/home-medical-supplies/hearing/hearing- aids/paying -for-your-hearing-aids-how-to-buy.htm.

8. Bibliography (research)  " Hearing Aids [NIDCD Health Information]." National Institute on Deafness and Other Communication Disorders [NIDCD]. N.p., n.d. Web. 16 Feb. 2012. <http://www.nidcd.nih.gov/health/hearing/  "Hearing Loss (cont.)." emedicineHealth. N.p., n.d. Web. 16 Feb. 2012..

9. Bibliography(photo)  "The Ear (Human Anatomy): Picture, Function, Definition, Conditions, and More." WebMD - Better information. Better health.. N.p., n.d. Web. 15 Feb. 2012..  "iPhone and iPad Apps Developer Training Course | NTI Leeds." NTI Leeds | Apple, Zend, Adobe, PRINCE2 and Project Management training courses. N.p., n.d. Web. 15 Feb. 2012..  "Headphone Audio – SRS Labs." SRS Labs. N.p., n.d. Web. 15 Feb. 2012..  "One Hundred Dollar Bill | Information on United States Currency." One Hundred Dollar Bill | Information on United States Currency. N.p., n.d. Web. 15 Feb. 2012..  "10 Best Apple iPod / iPhone Speakers - Audio Docks - 2011 | Tip Top Tens." Best Lists - Top 10 Lists @ TipTopTens.Com. N.p., n.d. Web. 15 Feb. 2012..

10.  "Hearing Aid Wholesale, Buy Cheap Hearing Aid, Discount Hearing Aid Online Shopping MostBuying.com - Online Store." Wholesale - Electronics Wholesale - Buy Wholesale Electronics from Leading Electronics Wholesaler. N.p., n.d. Web. 15 Feb. 2012..  "Lyric Hearing Aids | Better Hearing and Sound Quality with Invisible Hearing Aids." Lyric Hearing Aid - Extended Wear Hearing Aids - Invisible Hearing Aids. N.p., n.d. Web. 15 Feb. 2012..

11. The End  Thank you