1 Face value is the money amount the bond will be worth at its maturity, and is also the reference amount the bond issuer uses when calculating interest payments.  Coupon rate is the rate of interest the bond issuer will pay on the face value of the bond, expressed as a percentage.
The modern atomic theory traces back to ancient Greece where philosophers theorized that matter could be divided down until it reached a single, indivisible part. In the 19th century, this concept was brought into mainstream thought as physicists and chemists began to find more evidence for the existence of the atom.
Democritus did not originate the atomic theory; he learned it from its founder, Leucippus, the author of the Big Cosmology. While this work too has vanished, some conception of its contents may be obtained from Aristotle. He opposed the atomic theory, but in doing so he summarized its principal doctrines.