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Wednesday, 19 May 2021

Three Things I Don’t Know (Part I): Cold

So, I asked myself, what unanswered scientific questions do I have, and are there answers out there for me? I had a think. And I came up with a list of three questions – and did my research. So here is the first of my three “Things I don’t/didn’t know” – let’s find out whether there’s an answer!

Why do both children AND fatter people feel the cold less?

People with a higher BMI have more fat on their body; fat acts as an insulator, and keeps them warmer, meaning they feel the cold less than people with a lower BMI. ...So why do children also feel the cold less? Children tend to be smaller, have less fat on their bodies than grown ups, and have a bigger surface area to bulk ratio.

I turned to the internet…

Tuesday, 4 May 2021

Of quartz – A colourful problem

Where does colour come from? Pigments, we say: the ability of certain materials to absorb and reflect different colours of light as electrons are excited along or within their structure. It’s true: sometimes we have to go as deep down as the chemistry, the connectivity between atoms, to see where colour comes from. Other times we don’t.

Structural colour arises from the nanostructure of materials: the arrangement of atoms in giant structures, or of groups of molecules. As they cluster together, they form planes, angles, surface details, and other interesting geometry with gaps and overlaps the same size as the wavelength of light. Like the colours seen on an oil slick, this structural colour happens when light interacts with the shape of matter.