In this photo taken Tuesday, Dec. 3, 2013, are a few of the 1500 plant seeds tested in the making of plant-based foods at Hampton Creek Foods in San Francisco. Can plants replace eggs? A San Francisco startup backed by Bill Gates believes they can. Hampton Creek Foods is scouring the planet for plants that can replace chicken eggs in everything from cookies to omelets to French toast. Funded by prominent Silicon Valley investors, the upstart seeks to disrupt a global egg industry that backers say wastes energy, pollutes the environment, causes disease outbreaks and confines chickens to tiny spaces. (AP Photo/Eric Risberg)

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