Fibrous coatings inside cans of stout could replace the froth-creating plastic spheres.
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References
Lee, W. T., McKechnie, J. S. & Devereux, M. et al. arXiv:1103.0508v1 (2011).
Uzel, S., Chappell, M. A. & Payne, S. J. et al. J. Phys. Chem. B 110, 7579-7586 (2006).
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Milton, J. The widget-free way to foamy stout. Nature (2011). https://doi.org/10.1038/news.2011.140
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DOI: https://doi.org/10.1038/news.2011.140