Dogs

   Why can dogs hear so much better than humans? Dogs can hear higher frequencies than humans can. Puppies are born deaf and when some dogs age they may become deaf.  At the low end of the range dogs can hear about 40 hertz, while humans can hear about 20 Hz. At the high end dogs can hear about 45 Hz and Humans, 23 Hz. Dogs can hear higher pitches than humans do. They may bark at a vacuum cleaner because of the high annoying pitch. Dogs ears are more mobile. Dogs with ears standing up have better hearing then dogs with hanging ears. 

Citation:

"UCSB Science Line Sqtest." UCSB Science Line Sqtest. N.p., n.d. Web. 29 Jan. 2014.

 "Understanding a Dog's Senses." Understanding a Dog's Senses. N.p., n.d. Web. 27 Jan. 2014.

 "Nice Dogs." Flickr. Yahoo!, 25 May 2008. Web. 29 Jan. 2014.

Sharks

Great    White sharks are the largest predatory fish on earth. They can grow an average 15 feet. Hey have about 3,000 triangular teeth in several rows. Great whites have organs that sense small electromagnetic fields by animals. They eat sea lion, small whales, seals, and sea turtles. They live in cool coastal waters throughout the world. Of the 100 + shark attacks worldwide about one half are from great whites. Great whites can detect one drop of blood in 25 gal of water. They can sense tiny amounts of blood in the water up to 3 miles away.

 

"Great White Shark." National Geographic. N.p., n.d. Web. 15 Jan. 2014.

   

"Stanford Study: Great White Sharks More Endangered Than Tigers | The Unofficial Stanford Blog." The Unofficial Stanford Blog RSS. N.p., n.d. Web. 16 Jan. 2014.

MS

Multiple sclerosis (MS) is a disease that attacks the central nervous system which is made of the brain, spinal cord, and optic nerves. No one knows what the cause of the disease is. The symptoms are unpredictable and differ from one person to another. The disease occurs mostly in women from ages 20-40. MS is usually mild but some can loose the ability to walk, write, or speak. There is no cure for MS but there are some medicines may slow it down and control the symptoms.  

Citation 

"National Multiple Sclerosis Society." What Is Multiple Sclerosis? : National MS Society. N.p., n.d. Web. 06 Jan. 2014.

"MedlinePlus." MedlinePlus. N.p., n.d. Web. 04 Jan. 2014.