Khan Academy
Khan Academy: Humanity on Earth: Energy Inputs for Tilling a Hectare of Land
Discusses energy consumption and food production. Looks at ways humans till soil and the machinery that is used, and how much energy it takes to till a hectare of land. [13:41]
Khan Academy
Khan Academy: Humanity on Earth: Random Predictions for 2060
Sal's random predictions for the year 2060. [11:06]
Khan Academy
Khan Academy: Humanity on Earth: Understanding Calendar Notation
A video lecture helping you learn the difference between BC, BCE, AD and CE. The video also discusses a little bit about the birth of Jesus as well in regards to calendar notation. [9:41]
Khan Academy
Khan Academy: Humanity on Earth: Human Evolution Overview
A video investigating human evolution from the extinction of the dinosaurs to humanity today. [12:25]
Khan Academy
Khan Academy: Humanity on Earth: Development of Agriculture and Writing
Looks at the transition of humans from the Paleolithic Age, when humans used stone tools, up to the development of agriculture in the Neolithic Age, which made settlements possible. The next critical development was the advent of...
Khan Academy
Khan Academy: Humanity on Earth: Correction Calendar Notation
Correcting the time difference calculation by taking into account that there is no year 0. [4:12]
Khan Academy
Khan Academy: Humanity on Earth: Collective Learning
Video lecture explores how symbolic language drives collective learning and how this is one of the truly differentiating aspects of human beings relative to the rest of the animal kingdom. [13:17]
Khan Academy
Khan Academy: Humanity on Earth: Thomas Malthus and Population Growth
Thomas Malthus's views on population. Malthusian limits. [8:13]
Khan Academy
Khan Academy: Humanity on Earth: Land Productivity Limiting Human Population
A video lecture exploring how land productivity limits the growth of a population. Video addresses how human population densities are limited by the calories that can be produced from the land. [12:59]
Khan Academy
Khan Academy: Humanity on Earth: Firestick Farming
Video lecture explains how the indigenous Australians used fire to change their environment. [6:38]
Khan Academy
Khan Academy: Agriculture and Human Population
Thinking about how we get calories from the land limits human population densities. [12:59]