Tutoring high school science, you may be asked about the albedo effect. The tutor explains it simply. Albedo means loss of incoming radiation due to reflection. Light and heat are examples of radiation (see my previous post). Regarding Earth’s climate, …

Science, Climate change: the albedo effect Read more »

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The tutor investigates the idea that stainless steel is non-magnetic. I’ve heard from more than one source that stainless steel is non-magnetic: if you put a magnet to it, there isn’t attraction like you might expect with “ordinary” steel. According …

Stainless steel: magnetic or not? Read more »

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The tutor mentions a few points about diatoms. In my Feb 4 post I introduced protists, which constitute a kingdom of eukaryotic, mainly single-celled organisms. Protists are divided into plantlike and animal-like ones. Diatoms, from phylum Chrysophyta, are among the …

Biology: protists: diatoms Read more »

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The tutor reviews the progress of thought about atoms through the ages. Democritus, a Greek philosopher living around 400 BC, is credited as the first promoter of the concept of the atom. He proposed that all matter consists of tiny, …

Physics: models of the atom Read more »

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