Chest freezers were often kept in garages and other cold places and worked efficiently (and economically) by not having to fight central heating temperatures. I have read your column for years, and been impressed with the clear explanations you normally provide.
Amino acids are found in animal sources such as meats, milk, fish, and eggs. They are also found in plant sources such as soy, beans, legumes, nut butters, and some grains (such as wheat germ and quinoa). You do not need to eat animal products to get all the protein you need in your diet.
It's not cooked meat that made us human, he says, but rather cooked food. In any case, says Pollan, today's meat is nothing like that of the hunter-gatherer. One problem with the paleo diet is that they're assuming that the options available to our caveman ancestors are still there, he argues.