tl;dr Higher activation energy required to activate slip-systems Ductile and brittle are relative terms, since the deformation of a material and the corresponding mode of failure depends on many conditions in addition to crystal structure such a...
Skin cells live about two or three weeks. Colon cells have it rough: They die off after about four days. Sperm cells have a life span of only about three days, while brain cells typically last an entire lifetime (neurons in the cerebral cortex, for example, are not replaced when they die).
The A1C gives you the amount of glucose that the blood cells in the sample has been exposed to, the lifespan of a blood cell is 100 to 120 days and are produced all the time so the average age of blood cells in a sample is 30 to 40 days.