The origins of culinary began with primitive humans roughly 2 million years ago. There are various theories as to how early humans used fire to cook meat. According to anthropologist Richard Wrangham, author of "Catching Fire: How Cooking Made Us Human", primitive humans simply tossed a raw hunk of meat into the flames and watched it sizzle. Another theory claims humans may first have savoured roasted meat by chance when the flesh of a beast killed in a forest fire was found to be more appetizing and easier to chew and digest than the conventional raw meat.