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Explainers

What Is a Data Center, Actually?

Every search, stream, and AI chat you've ever done was processed somewhere—usually inside a windowless building most people will never see. Here's what a data center actually is and how it works.

BriefLookout · 18 Sep 2026 · 3 min read

Science

Your brain's immune cells were supposed to be sealed in for life. In humans, blood cells start joining them at middle age.

A Stanford team traced shared mutations between blood and postmortem brain tissue — the same logic an ancestry test uses — and found circulating immune cells taking up residence in the aging human brain as functional microglia. Mice don't do it. The non-human primates tested didn't either. This is not a story about a leaky barrier.

BriefLookout · 26 Aug 2026 · 4 min read