It is based on the fact that amino acids (the building blocks of all proteins) exist in two mirror image forms, both of which otherwise have the same chemical structures.
The L-amino acid molecule form has an extension to the left, while the D-amino acid form has an extension to the right.
That means that the play was without fail written after (in Latin, post) 1587.
The same inductive mechanism is applied in archaeology, geology and paleontology, by many ways.
Since weather patterns tend to run in cycles of a number of years, the sequence of tree-rings in a region will also reflect the same cycling, as illustrated by the graph below.
Understanding the ages of related fossil species helps scientists piece together the evolutionary history of a group of organisms.In this article we shall discuss how we can use the paleomagnetism in rocks to attach dates to them (paleomagnetic dating).The reader may find it useful to go back and read the main article on paleomagnetism before continuing.For example, based on the primate fossil record, scientists know that living primates evolved from fossil primates and that this evolutionary history took tens of millions of years.By comparing fossils of different primate species, scientists can examine how features changed and how primates evolved through time.