To be published in the Proceedings of Dark 2000: Third International Conference on Dark Matter in Astro and Particle Physics, Heidelberg, Germany, July 10-16 2000
Abstract. The current status of big bang nucleosynthesis is summarized. Particular attention is paid to recent observations of 4He and 7Li and their systematic uncertainties. Be and B are also discussed in connection to recent 7Li observations and the primordial 7Li abundance.
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