Dating range equation
According to internet lore, there’s a mathematical equation that governs the lower bound for the socially acceptable age of a potential dating partner: half your age plus 7, or, in mathematical terms, if x is your age then the lower bound is f(x) = x/2 7. if you’re 20, then the minimum socially acceptable age for a date is 17.
But it was The Ragbag who pointed out that this rule has a duality: for the date to be socially acceptable, the rule must be adhered to by your date as well.
and is now the principal source of information about the absolute age of rocks and other geological features, including the age of fossilized life forms or the age of the Earth itself, and can also be used to date a wide range of natural and man-made materials.
The Ragbag: The half your age plus 7 rule offers daily e-mail updates about R news and tutorials on topics such as: Data science, Big Data, R jobs, visualization (ggplot2, Boxplots, maps, animation), programming (RStudio, Sweave, La Te X, SQL, Eclipse, git, hadoop, Web Scraping) statistics (regression, PCA, time series, trading) and more...After one half-life has elapsed, one half of the atoms of the nuclide in question will have decayed into a "daughter" nuclide or decay product.In many cases, the daughter nuclide itself is radioactive, resulting in a decay chain, eventually ending with the formation of a stable (nonradioactive) daughter nuclide; each step in such a chain is characterized by a distinct half-life.In other words, there’s a socially acceptable maximum too, given by inverting the equation: It was only yesterday that i realised that the rule of thumb for dating people of different ages (the “half your age plus 7” rule) determines not only the lower bounds for dating but the upper bounds as well—that for each ½x 7, there is a corresponding 2(x-7).For the last 15 years of my life, i have been ignoring an entire market segment, namely those of the genus The Ragbag handily plotted out the socially acceptable upper and lower bounds for dates at various ages in the chart below: Notably, the chart also implies that there is a socially acceptable lower bound for your age: below the age of 14, by this rule, you shouldn’t be dating at all.
Precision is enhanced if measurements are taken on multiple samples from different locations of the rock body.