The Withings scale measures your weight, body fat %, pulse rate, temperature, and CO2 levels in your home.
It connects to the wifi in your home and communicates with the Withings app on your iPhone and Android. You never have to connect anything to anything. The data flows over the air from scale to phone. The app provides a timeline of your key stats and gives you goal settings for them.
Smell is chemistry, and the chemistry of old books gives your cherished tomes their scent. As a book ages, the chemical compounds used—the glue, the paper, the ink–begin to break down. And, as they do, they release volatile compounds—the source of the smell. A common smell of old books, says the International League for Antiquarian Booksellers, is a hint of vanilla: “Lignin, which is present in all wood-based paper, is closely related to vanillin. As it breaks down, the lignin grants old books that faint vanilla scent.”
A study in 2009 looked into the smell of old books, finding that the complex scent was a mix of “hundreds of so-called volatile organic compounds (VOCs) released into the air from the paper,” says the Telegraph. Here’s how Matija Strlic, the lead scientist behind that study, described the smell of an old book:
A combination of grassy notes with a tang of acids and a hint of vanilla over an underlying mustiness, this unmistakable smell is as much a part of the book as its contents.