Explainers, deep dives, and everyday things worth understanding.

Seven categories, one approach. Start with what you noticed.

MoneyNovember 2, 2026

A card approval is the issuer's yes to a payment. The money moves later through clearing and settlem...

HealthNovember 2, 2026

Fingerprint ridges cut contact area on dry acrylic glass by about one third. Sweat can later raise friction on glass, so the story has two parts.

ScienceOctober 31, 2026

A CD's spiral track is spaced about 1.6 micrometres apart, so it splits white light into colours by diffraction. Tilt it and the colours shift.

HomeOctober 31, 2026

Salt takes up water vapour in humid air, but lumps form when that moisture dries again. Impurity salts can make clumping start at lower humidity.

NatureOctober 29, 2026

Waves can flash blue at night when dinoflagellates, tiny plankton, are disturbed. The flash is fast, but only some species and some coasts glow.

CarsOctober 26, 2026

A tyre pressure light reports low pressure and says nothing about the cause. Temperature, leaks, punctures and faults can each trigger it.

TechOctober 24, 2026

Phone makers pack in tens of megapixels, but lens physics, light and processing limit the detail you can use. Here is why phones now merge pixels.

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