Bulgaria is celebrating 1,300 years of nationhood next year, and scientific events are among the festivities. But as Vera Rich reports, the best birthday present the country could have would be a pollution-free water supply
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A birthday party with real rockets. Nature 285, 65 (1980). https://doi.org/10.1038/285065a0
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DOI: https://doi.org/10.1038/285065a0