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Tiny life forms like viruses, bacteria, fungi, and protozoa are essential to Earth's physical and biological systems, aiding in wastewater treatment and environmental cleanup. Humans have harnessed these microscopic organisms for millennia in food and beverage production, though certain varieties can trigger severe illnesses. Despite being Earth's earliest residents, we've identified just a fraction of existing microbial species. Modern microbiology is leading a technological breakthrough, combining ultra-sensitive molecular techniques with advanced computing to decode life's mysteries. This program offers comprehensive insights into microscopic biology, microbial impacts on health and disease, and how mammalian immune systems combat infections.