The story of MIT's notorious 27-year-old milk carton illustrates how discarded items can become subjects of scientific curiosity.
Louis Pasteur's experiments on fermentation and pasteurization proved that microorganisms cause spoilage, leading to modern food safety practices.
Probiotics are live microorganisms marketed as beneficial, but many products like probiotic tea may contain heat-resistant spores that survive boiling water.
The author's experiment culturing BC30 (Bacillus coagulans) from Bigelow probiotic tea showed bacterial growth even after boiling, due to spore formation.
BC30 spores are heat-resistant and shelf-stable, but the clinical dose required for digestive benefits is far higher than found in a cup of tea.
The probiotic industry's health claims often lack rigorous efficacy evidence, as GRAS designation only requires safety proof from the manufacturer.
Pasteurization kills harmful microbes but not all bacteria, while sterilization requires higher temperatures; most probiotics are not required to undergo clinical trials.
Understanding microbial communities may lead to dietary interventions rather than single-species probiotics for gut health.