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.
Another development of the Olmec which spread to other Mesoamerican civilizations was writing. In Mesoamerica, the concept of writing appears to have been first developed by the Olmec. In addition, they used the concept of zero in their mathematics.