Figure 1. This rhyolite matrix specimen contains opal-filled cavities displaying play-of-color. Photo by Eric Welch; courtesy of Opalos & Artesanias Mexicanas. Jorge Tamayo Carrillo (Opalos & ...

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The Trump administration will give a one-month tariff exemption on vehicles coming into the United States through a trade agreement between the U.S., Mexico and Canada, the White H... Seoul's spy ...

Fonio – a gluten-free grain with many nutritional benefits – has been cultivated as a subsistence crop in West Africa for thousands of years.