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What Is the Magnetic Constant and Why Does It Matter?

This persnickety number determines the strength of magnetic fields. It figures in everything from motors and generators to ...

Gear News of the Week: Always-Recording Smart Glasses, and Google Teases a New Nest Speaker

Plus: Masimo sues the US Customs and Border Protection over the Apple Watch's blood oxygen sensor, Insta360 has a new action camera, and BikeOn's power meter is tiny and affordable.

Costa Rica

Find the latest Costa Rica news from WIRED. See related science and technology articles, photos, slideshows and videos.