Guns,+Germs+&+Steel

Topics:

 * Crops ||  || Animals ||   || Germs ||   || Technology ||   || Geography ||
 * wheat ||  || cattle ||   || smallpox ||   || steel ||   || latitude and climate ||
 * rice ||  || goats ||   || malaria ||   || writing ||   || shape of the continents ||
 * corn ||  || sheep ||   ||   ||   || printing press ||   || cities and civilizations ||
 * sorghum ||  || pigs ||   ||   ||   ||   ||   ||   ||
 * ||  || llamas ||   ||   ||   ||   ||   ||   ||
 * ||  || horse ||   ||   ||   ||   ||   ||   ||
 * ||  || zebra ||   ||   ||   ||   ||   ||   ||
 * ||  || zebra ||   ||   ||   ||   ||   ||   ||

PBS: Guns, Germs and Steel

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