America's longest-serving prisoner in solitary has conviction quashed. Albert Woodfox, right, and Herman Wallace in Angola prison, in Louisiana. Woodfoxâs 1972 murder conviction was overturned when a US appeals court ruled his conviction was secured through racially discriminatory means.
Next, the Olmec created a complex drainage system. These inventions helped the Olmec survive. In addition to their inventions, they also understood many things in life, such as the concept of zero ,linear time, and gravity.
1 A brief treatment of Olmec civilization follows. For full treatment, see pre-Columbian civilizations: The rise of Olmec civilization. 2  The chief Olmec sites are San Lorenzo, La Venta, Laguna de los Cerros, and Tres Zapotes in what is now southern Mexico.