Below is a sample signal, found by Hartmut Holzwart in April
2006, that travels against the grain at 2c/3. This "negative
spaceship" travels upward and will quickly reach the edge of the
finite patch of stabilized agar shown here.
Holzwart proved in 2006 that 2c/3 is the maximum speed at which
signals can move non-destructively against the grain through zebra
stripes agar.
Game of Life Explanation
The Game of Life is not your typical computer game. It is a cellular
automaton, and was invented by Cambridge mathematician John Conway.
This game became widely known when it was mentioned in an article
published by Scientific American in 1970. It consists of a grid of
cells which, based on a few mathematical rules, can live, die or
multiply. Depending on the initial conditions, the cells form various
patterns throughout the course of the game.
Rules
For a space that is populated:
Examples
Each cell with one or no neighbors dies, as if by solitude.
Each cell with four or more neighbors dies, as if by
overpopulation.
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