Vitamin B-12 deficiency anemia caused by a lack of intrinsic factor is called pernicious anemia.

CNN: Vitamin deficiency anemia

Without intrinsic factor, vitamin B-12 can't be absorbed and leaves your body as waste.

CNN: Vitamin deficiency anemia

However, a vitamin B-12 deficiency is most often due to a lack of a substance called intrinsic factor.

CNN: Vitamin deficiency anemia

Lack of intrinsic factor may be due to an autoimmune reaction, in which your immune system mistakenly attacks the stomach cells that produce it.

CNN: Vitamin deficiency anemia

My co-researchers and I in our IBM Institute for Business Value study, Collective Intelligence: Capitalizing on the Crowd, we have pointed to intrinsic motivation as well as a strong factor to drive not just individual work but collective crowdsourcing.

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