One of the speakers in the creationist video which Scott posted cited as evidence against abiogenesis the fact that life never spontaneously appears in sealed jars of peanut butter, even though a billion jars of peanut butter are manufactured every year.

This is a silly argument for a number of reasons, but what I find most noteworthy is the idea that a billion such "experiments" per year is an impressive number. I suspect that one of the reasons many people find abiogenesis and speciation implausible is that they fail to take into account the truly unfathomable amounts of space and time which the forces of evolution have at their disposal.

Suppose that a jar of peanut butter is half a liter. A billion jars, then, would be 500 megaliters, or 500,000 cubic meters--roughly equivalent in size to a lake with an average depth of 10m and a diameter of 250 meters.

At .0005 cubic kilometers, a year's supply of peanut butter is about one one-millionth the size of Lake Erie, and Erie is in turn dwarfed by the world's oceans by a factor of about 2.7 million. Earth's oceans had hundreds of billions times more space to devote to cooking up life than all the jars of peanut butter ever made. They also had much more time--on the order of hundreds of millions of years--than peanut butter has had.

And we don't know for a fact that Earth is the only chance the universe has had to produce life. There's no consensus on the number of Earth-like planets in our galaxy, but there could conceivably be billions, and there are billions of galaxies in the known universe--to say nothing of what, if anything, may lie beyond the limits of the known universe.

Nor do we know how long it has taken us to reach this point. The known universe is estimated to be 10-15 billion years old, but we haven't the slightest idea what, if anything, came before. Trillions of years may have passed before intelligent life emerged for the first time, and we wouldn't be able to tell the difference. 

Much of this is highly speculative, of course. But the point is that the improbability of abiogenesis is irrelevant. The vast scale of the Earth alone--to say nothing of the rest of the known universe, or the unknown--is sufficient to give rise to staggeringly unlikely coincidences. And if the universe is truly eternal, then anything which is theoretically possible, no matter how unlikely, was bound to happen sooner or later.

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There's another scale you

There's another scale you didn't mention, the scale of life. The video depicts an ant in the peanut butter jar. If life did appear in a peanut butter jar, it wouldn't look like a full-fledged ant with legs and antenna, in fact it would most likely be too small to be observed. Although the video does not explicitely say it, the image is carefully chosen to implicitely represents abiogenesis as a crude form of "spontaneous generation".

Ten years ago, I vowed to

Ten years ago, I vowed to quit the blog if and when somebody posted about peanut butter oceans. But now that day is finally here, and I'm hesitant.

Once you start talking about going beyond the limits of the known universe, both temporal and spatial, your argument loses force, since such concepts are mystical, and on a par with things theological.

Also, you failed to consider the existence of 1. Campbell's Split Pea Soup, and 2. canned fruit cup.

And any new life would probably be eaten

The peanut butter jar is far from sterile. There are microbes in it. If organic chemicals in the peanut butter jar did combine to a brand new start for life, that primitive brand new start would probably be eaten by the existent microscopic life withing the jar.

And if it didn't it would be eaten by a person, and maybe destroyed in their digestive track, or broken down by bacteria inside the person who eats the peanut butter. Its not like someone is doing complex analysis on every jar of peanut butter. And even if they where they might not notice the small new life form. If they do notice it they might not recognize that its a new type of life, and if they did recognize that, they might only think its a new species (perhaps some new form on a level much higher than species, like a new class or phylum), and not recognize that it was a brand new start for life.