In a dividing cell, chromosome pairs are pulled apart thanks to attachment sites called centromeres. Yeast genomes reveal key steps in how centromeres have evolved.
The protests on Thursday appear to be the most widespread since the movement began on December 28.
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The days before we all had mobile phones. Photograph: Debrocke/ClassicStock
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The keyboard is lovely to type on with good pitch between the keys and nice travel — maybe a hair more than I generally like, but that's subjective. The layout is easy to use, though it doesn't have the number pad that you'll often find with a 16-inch laptop. That's sacrificed for the speaker grilles on either side of the keyboard.