Figure 12.13 shows the yield curve for December 4, 2006. What is notable about this yield curve? 
(Source: U.S. Department of the Treasury)
Definitions:
Integumentary System
The organ system that protects the body from various kinds of damage, such as loss of water or abrasion, and includes skin, hair, nails, and exocrine glands.
Diabetes
A chronic condition characterized by high blood sugar levels due to the body's inability to produce or use insulin effectively.
Graves' Disease
An autoimmune disorder leading to an overactive thyroid gland, resulting in symptoms such as increased heart rate, weight loss, and eye problems.
Exophthalmos
Note: Exophthalmus is already in the glossary as exophthalmia. It can be spelled exophthalmos, exophthalmus or exophthalmia.
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