You might have noticed that water can taste a bit off sometimes, especially if you leave a glass or open bottle out over night. But is that odd taste is an indicator that the water has gone bad? That’s hard to answer, Esther Inglis-Arkell explains for io9.
When you drink from a glass, you introduce microbes from your lips, mouth and saliva into the water and its container, Inglis-Arkell writes. “They’ll often be joined by whatever is riding around on the dust swirling in your house,” she notes. These microbes beget more microbes in environments with balmy temperatures. The colder the room the longer the bottle or glass of water will keep. Read more
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