Cost had to be a major factor in the decision, because that issue dominates the airline industry, and H-P had more at stake than any other vendor.

The team discovered that a certain B. subtilis signalling molecule, known as competence and sporulation factor (CSF), is detected by human gut cells (Cell Host &Microbe, vol 1, p 299).

A colloid of life is the unknown factor between the animate and the inanimate." (Jubbs Cell Rejuvenation, p.14.)