Starting in 1996, Alexa Internet has been donating their crawl data to the Internet Archive. Flowing in every day, these data are added to the Wayback Machine after an embargo period.
The Heart - The heart is made up of four main chambers, two ventricles and two atria. This animation illustrates the flow of blood through the heart, to and from the four main vessels that connect to it.
Breathing - The respiratory system keeps us alive by oxygenating the blood in our bodies. This animation illustrates how the various pieces of the respiratory system work together.
The Digestive System - The digestive system is a complex combination of mechanical and chemical processes. This animation explains how the different parts work together to digest food.
