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There are two types of solid structures that aren't made of simple repeating units: glasses and quasicrystals. When a crystal forms from a melt it requires the atoms/molecules in the melt to reoganise into the crystal structure. If the rate of solidification is fast enough the atoms/molecules don't have the time to reorganise and the solid formed is ...


The calibration of the digital devices drifts. When calibrating some temperature probes for a neutrino experiment we used a deionized-water ice bath. The four laboratory digital thermometers we found (all claiming between $\pm 0.05$--$0.25\,^\circ \mathrm{C}$ accuracy) read between $-0.5$ and $+1.8\,^\circ\mathrm{C}$. Clearly some were well outside their ...

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