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There are plenty of good sources online explaining the principle behind radiocarbon dating. For instance, the wikipedia explains: During its life, a plant or animal is in equilibrium with its surroundings by exchanging carbon either with the atmosphere, or through its diet. It will therefore have the same proportion of $\ce{^14C}$ as the atmosphere, or in ...


8

The metabolism of living creatures keeps the dynamic equilibrium of their $\ce{^{14}C/^{12}C}$ ratio with the enviromental $\ce{^{14}C/^{12}C}$ ratio via photosynthesis, breath, food and excrements. It is not just about one time building, but also about continuous recycling of the body content. Such an equilibrium means continuous resetting of the $t=0$ ...


7

There is a clear explanation and figure showing this in the following reference: Anton Gorkovskiy, Kent R. Thurber, Robert Tycko, Reed B. Wickner, PNAS 2014, 111 (43) E4615-E4622. A parallel beta sheet is one where the direction from N- to C-termini on adjacent strands run in a parallel direction (rather than antiparallel). In-register means that each ...


1

In addition to all the qualities @Karl stated (harmless, edible, overspray decomposes, etc.), such a coating would also need to stretch as the produce grows. Such a protective covering might even obviate the need for pesticides, if it were to be created. That said, there are edible wax and protein coatings to preserve produce after it's picked. ...


1

While we are alive, we are constantly replacing our molecules. With every breath cycle, you get rid of some of your carbon (CO2). With every meal, you take in new carbon (carbohydrates, proteins, lipids). The carbon in your body gets cycled as your cells die and are replaced. This replacement process stops when you die. After this, whatever carbon remains ...


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