What are mesofacts?
When people think of knowledge, they generally think of two sorts of facts: facts that don't change, like the height of Mount Everest or the capital of the United States, or facts that change a lot, like the weather or the stock market close. But in between there is a third timescale, with its separate category of facts: facts that change slowly. This middle, or meso-, scale, of facts are the most interesting and yet the most slippery with which to be acquainted. These change over the course of a single human lifetime but we tend to nonetheless view them as constant.
My book The Half-Life of Facts about changing knowledge, including mesofacts, is out now!
"The Half-Life of Facts is easily one of the best books of the year on science" -Bloomberg
Please check it out.
"The Half-Life of Facts is easily one of the best books of the year on science" -Bloomberg
Please check it out.

World Population Over Time
Mesofacts.org is devoted to an awareness of this class of mesoscale facts, or mesofacts. We hope to increase an awareness of such mutable knowledge and to provide continuing education of these slowly changing facts.
We provide a clearinghouse for all the devices and software designed to help individuals become aware of the slowly changing facts in our everyday life. Need a desktop widget for the current population or the number of planets known outside our Solar System? Mesofacts is where you want to be.
For more information, please read an introductory essay about mesofacts, by our founder Samuel Arbesman. And if you want to see more visualizations of mesofact progressions, please check out the blog.
In addition, you can sign up for the Mesofact newsletter.
We provide a clearinghouse for all the devices and software designed to help individuals become aware of the slowly changing facts in our everyday life. Need a desktop widget for the current population or the number of planets known outside our Solar System? Mesofacts is where you want to be.
For more information, please read an introductory essay about mesofacts, by our founder Samuel Arbesman. And if you want to see more visualizations of mesofact progressions, please check out the blog.
In addition, you can sign up for the Mesofact newsletter.