The Aztec deity Xolotl was seen as the twin brother of Quetzalcoatl, the feathered serpent god linked with life and light. In many ways, Xolotl was Quetzalcoatl’s opposite. He was associated with ...

Male wearing glasses: Common letter patterns are really important, it helps with your spelling. Things like tight, has I-G-H-T on the end of it, tight. Male in dark suit: It's like it and then how ...

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Mexico’s Maya and Aztec pyramids deserve a spot high on your travel list. These were once holy spaces for ancient civilizations, and each offers a moment of complete awe and a rare look into history.

Pattern formation is the developmental process by which cells acquire different identities, depending on their relative spatial positions within the embryo. Pattern formation ensures that tissues ...

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