Brown adipose tissue is present in small mammals (e.g., mice) and in newborn humans. Most of it disappears in adult humans. The cells in both types of fat are called adipocytes although they differ in origin, structure, and function in the two types of tissue.
On the left hand, index finger. It's not the index finger you wear it on. Left hand, ring finger. The finger that you would wear a wedding ring on.
A purity ring is a ring that represents a promise, vow, commitment or goal to abstain from sex until marriage. Purity rings are typically worn on the left ring finger. It is significant, in the fact that it is the same finger on which a wedding ring is worn.