> terahertz waves, which are smaller and have much higher frequencies than radio waves. Strange language, this journalist uses. "Terahertz waves" are radio wav

> terahertz waves, which are smaller and have much higher frequencies than radio waves. Strange language, this journalist uses. "Terahertz waves" are radio waves, although they're more commonly called far-infrared. It's not clear to me what the tag itself does, apart from the glue. Apparently it serves only to hold the glue in place, and so is 100% redundant. Or perhaps the talk about "slots" explains the purpose of the tag: it sounds like a grating, but the article doesn't explain why you need a grating.