- Although Seattle’s Maple Leaf neighborhood appeared in the 1890s as a dream of real estate developers, the hilltop community northeast of Green Lake was slow to grow. The last half of the twentieth century saw dramatic changes to the area, but Maple Leaf remained a stable home to middle-class families. The residents were late to organize themselves politically, but their patient and focused persistence soon gained nationwide recognition.
- Natural number (Wikipedia)
In mathematics, the natural numbers are the numbers 1, 2, 3, etc., possibly including 0 as well. Some definitions, including the standard ISO 80000-2, begin the natural numbers with 0, corresponding to the non-negative integers 0, 1, 2, 3, …, whereas others start with 1, corresponding to the positive integers 1, 2, 3, … Texts that exclude zero from the natural numbers sometimes refer to the natural numbers together with zero as the whole numbers, while in other writings, that term is used instead for the integers (including negative integers). In common language, particularly in primary school education, natural numbers may be called counting numbers to intuitively exclude the negative integers and zero, and also to contrast the discreteness of counting to the continuity of measurement—a hallmark characteristic of real numbers.