Agar was first introduced into the laboratory in 1881. Since then, microbiologists have depended on agar to create strong jellies. When microorganisms are streaked or plated onto this jellied surface and incubated, individual cells multiply into distinct colonies that scientists can easily observe, select, and propagate for further experiments. Many of the most important findings in biological research of the last 150 years or so — including the discovery of the CRISPR/Cas9 gene-editing tool — have been enabled by agar.4 Agarose, a derivative of agar, is also essential in molecular biology techniques like gel electrophoresis, where its porous gel matrix separates DNA fragments by size, enabling researchers to analyze and isolate specific genetic sequences.
Nature, Published online: 25 February 2026; doi:10.1038/s41586-026-10217-z
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This week, we're diving into the big changes at Xbox and what it all means for Microsoft's gaming future. Phil Spencer, the longtime face of Xbox, announced he's retiring last week. He'll be replaced by Microsoft's former CoreAI CEO Asha Sharma, instead of his longtime deputy Sarah Bond, who plans to leave the company. Will this change actually help the beleaguered Xbox division, or is it another example of Microsoft shoving AI into everything?