For all the trivia buffs, enjoy these largest and longest according to Wikipedia.com and my knowledge too.

1. What is the longest word in the dictionary?
2. What is the longest web page?
3. What is the longest muscle in the human body?
4. What is the single, longest nerve in the human body?
5. What is the longest head of hair ever recorded?
6. What animal (mammal)  has the longest tail?
7. What muscle group in the human body can remain contracted longer?
8. What is the heaviest dog?
9. What is the tallest dog?
10. here is the largest house?

Now for the answers for you: 

1. The longest word is pneumonoultramicroscopicsilicovolannconiosis. This is a Lung disease acquired  by the inhalation of silica particles.
2. The longest web page is:  http://www.rekordversuch.de/recordholders/de/leengste/lang-htm 
3. The longest muscle in the human body is the Sartorius, which is in the thigh. 
4. The longest single nerve in the human body is the sciatic nerve in the thigh. 
5. The longest head of hair was measured 18 feet 5.54 inches on Xie Qiuping of China in May of 2008. 
6.  The Giraffe has the  longest tail of any land mammal as well as the longest neck too. 
7. The muscle group in the human body that can stay contracted the longest is the smooth muscle group. This muscle group can be found in blood vessels, hair follicles, urinary tracts and genital tracts. 
8. The heaviest dog is the English Mastiff. 
9. The tallest dog is the Irish Wolfhound. 
10.  A brand new home will be the largest house when it is completed in Mumbai, India. It will have 400,000 square feet of living space and will be 570 feet tall. The cost is estimated between 1 and 2 Billion dollars.