The principles presented in this chapter stem mostly from common sense; they involve the exercise of our inherent capacity for skepticism, judgment, free thinking, questioning and understanding.
这一章要说的原则大部分来源于常识，他们涉及到我们天生的怀疑、判断、自由思考、质问和理解能力的锻炼。
2
Halliwell noted, though, that C. elegans can not be used to study the effect of free radicals on stem cells, which evidence suggests may be important.
Such virus-free cells could eventually be used to test new cardiac drugs, or for stem cell-derived implants to help patients whose cardiomyocytes die in a heart attack, according to Hopkins.