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What is changing. Why it matters.

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Explainers / Analysis

Why a plateau in Arctic melt-season length is not evidence of sea-ice recovery

NASA’s September 21 melt-season account and its April 3 Barents Sea report describe different Arctic ice measurements, time windows and spatial scales. Read together, they caution against treating a stable duration metric as proof of recovery or a March maximum as a direct rebuttal.

On our radar

Explainers / Analysis

Why Webb Sometimes Blocks Light to Separate Bright, Close Detail

NASA’s August 4, 2026 Webb post spotlights a counterintuitive tool: a seven-hole mask that blocks most incoming light. The point is not more photons, but cleaner angular information when bright features sit very close together.

Follow the signal

Explainers / Analysis

Why NIST26 can list more spectra than compounds

NIST’s June 2026 library release uses several different counts at once: chemical identities, spectra and replicate spectra. Reading those units carefully explains how a library can grow by adding new compounds, extra measured records for existing compounds, or both.

Explainers / Analysis

A machine-readable profile can point to a test without proving anything passed

W3C’s new Profiles Vocabulary can describe a specification profile and link resources such as schemas or validation tools. That matters for discovery, but the source record does not show any dataset being tested or passing, and the draft leaves conformance rules to individual communities.

Explainers / Analysis

Autumn color and vegetation indexes answer different questions

NASA’s September 14, 2026 Coppermine River image pair shows a visible seasonal change between July 27 and September 6. That does not make it a vegetation-index result: NDVI and EVI require near-infrared data and calculations the page does not provide.

Explainers / Analysis

Why a cold-atom thermometer can read a warmer room

NIST’s 2025 Cold Atom Thermometer looks counterintuitive because its rubidium atoms are cooled to about 0.5 millikelvin. The key distinction is that the cooling prepares a cleaner sensor, while the reported temperature comes from blackbody radiation in the surrounding environment.

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