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Probiotics are not a one-size-fits-all solution. With over 3,000 bacterial species in the human gut and each person carrying a unique microbial fingerprint, strain specificity, timing, and individual context determine whether a probiotic helps, hinders, or does nothing at all.
A faded hand stencil in the Liang Metanduno cave on Muna Island, Indonesia, has been dated to at least 67,800 years ago, making it the oldest known cave art in the world. The discovery, published in Nature, pushes back the timeline of human artistic expression by more than 16,000 years.