Pirkei Avot (Hebrew: פרקי אבות‎), which translates to English as Chapters of the Fathers is a compilation of the ethical teachings and maxims of the Rabbis of the Mishnaic period. Because of its contents, it is also called Ethics of the Fathers. The teachings of Pirkei Avot appear in the Mishnaic tractate of Avot, the second-to-last tractate in the order of Nezikin in the Talmud. Pirkei Avot is unique in that it is the only tractate of the Talmud dealing solely with ethical and moral principles; there is little or no halacha found in Pirkei Avot.

In the Talmudic sense, the word avot, meaning "fathers", refers to fundamentals, or principal categories. Thus, the principal categories of creative work forbidden on Shabbat are called avot melacha, and the principal categories of ritual impurity are referred to as avot tum'ah. Perakim, or in the conjunctive form pirkei, means "chapters". Thus Pirkei Avot means "Chapters of Fundamental Principles".

The recognition of ethical maxims as 'Fundamental Principles' may derive from the high regard in which the Torah and Talmud hold such wisdom. "Love your neighbor as yourself," states the Bible (Leviticus 19:18), an injunction that Akiva ben Joseph in Genesis Rabbah 24:7 famously calls a "great principle" of the Torah (or perhaps "the greatest principle"). In Shabbos 31a, Hillel says "That which is hateful to yourself, do not do to your friend: This is the entire Torah, the rest is commentary, go now and learn it." The attribution of Biblical Wisdom books to King Solomon (e.g., Ecclesiastes, Proverbs, Book of Wisdom) attests also to the central importance that Jews of this period placed on transmitting the ethical way of life.

Una Vida is an archaeological site located in Chaco Canyon, San Juan County, New Mexico, United States. Its construction began around 900 AD and it is one of the three earliest Chacoan Anasazi great houses; it. Comprising at least two stories and 124 rooms, it shares an arc or D-shaped design with its contemporaries, Peñasco Blanco and Pueblo Bonito, but has a unique "dog leg" addition made necessary by topography. It is located in one of the canyon's major side drainages, near Gallo Wash, and was massively expanded after 930 AD.

The site is surrounded by Anasazi rock art and petroglyphs that depict human figures, solar signs, and geometric forms. It was first recorded in the mid-19th century by US military that were surveying the area of modern New Mexico.

Una Vida means "One Life" in the Spanish language.

Chaco Road is a network of roads (for travel and trade) which radiated from great house sites, such as Pueblo Bonito, Chetro Ketl and Una Vida. This road lead to smaller sites on the periphery of Chaco Canyon.