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Welcome to the science podcast for September 5th, 2014.

I'm Sarah Crespi.

In this week's show, we talk about scaling up a biofuel,

and David Grimm is here with a roundup of daily news stories.

Support for the science podcast is provided by AAAAS, the American Association for the Advancement of Science, advancing science, engineering, and innovation throughout the world

for the benefit of all people.

AAAS, the Science Society, at www.aAAS.org.

Cellulosic ethanol is a type of biofueled from the usually non-usable parts of plants, wood chips, hardy grasses,

corn stalks. It's called cellulosic because it's made by breaking down lignacelios, the bulk of

the biomass in most plants. The road to making cellulosic fuels widely available has been a

tough one. I spoke with science news writer,

Bob Service, about the journey to the first large-scale cellulosic ethanol plant. And what happens next?

Cellulosic ethanol is ethanol, which is an alcohol that is used as a transportation fuel.

Most ethanol is made from sugar.

You start with sugar and then you feed it to yeast in a fermentation tank,

and the yeast convert that sugar into ethanol.

...