Cells—the basic constituent of life—recycle and reuse their constituents, and they have survived on Earth for over three billion years. All cells do this.
Three billion years. They are on to something.
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Medicine/fitness My articles on health and fitness. I'm not comfortable giving health advice. This is not to be taken as such. I do enjoy relaying current research ideas for discussion with a qualified health care practitioner.
Chemistry Here are some of my answers to questions on chemistry from my students and from the general public.