During your lifetime, many of your atoms go through multiple hosts. We just borrow them, rearranging them into our particular configuration.
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Thus, there are atoms in you that are as old as the universe. Whether they were made in a star or were synthesized early in the formation of the universe, it's amazing.
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Chemistry Here are some of my answers to questions on chemistry from my students and from the general public.
Medicine/fitness
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.