Given the background description of some cooking related query, summarize the question into a title

Q: Recently, I observed that there is some brown slimy stuff on the underside of my plates. I don't know what they are or how they form. I tried removing it with a tooth pick, but was too hard to come off. Does anyone know what this is? How can it be cleaned?

A: What is this slimy coloured stuff growing in my plates?
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Q: When I make yogurt, I freeze some of the yogurt for the next time. However, I concentrate the yogurt by pouring it into a cloth, and extracting the yogurt whey (I do not know if it is called whey like cheese).Is the culture in the yogurt whey? Do I lose culture by concentrating the yogurt?Is salt harmful for the culture? Do I necessarily need to store the culture before adding salt to yogurt?

A: How to catch culture out of yogurt?
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Q: I'd like to try my hand at baking my own bread. Do I need a bread maker to get decent bread? Are there any advantages to using a bread maker vs. my normal oven?

A:
Do I need a bread maker?
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