Xenophobia 88 X-rays 71 X-ray crystallography 67 XML (Document markup language) 48 X-ray spectroscopy 26 Xhosa (African people) 23 Xenobiotics 15 X-ray astronomy 10 Xavante Indians 10 XHTML (Document markup language) 9 Xenografts 9 X chromosome 7 X-Ray Spectroscopy 7 X-ray lasers 6 X-ray microanalysis 6 X-ray spectroscopy in archaeology 6 X-rays -- Scattering 6 Xenopus laevis 6 X-ray optics 5 X-ray absorption near edge structure 4 X-ray photoelectron spectroscopy 4 Xanthium 4 Xeriscaping 4 Xénophobie 4 Xi, Jinping 4 Xylophone music 4 X-15 (Rocket aircraft) 3 X-Men (Fictitious characters) 3 Xenografts -- Moral and ethical aspects 3 Xenophobia -- South Africa 3 Xerography 3 Xhosa poetry 3 Xinjiang Uygur Zizhiqu (China) -- History 3 Xylophone 3 X Chromosome Inactivation 2 X, Malcolm, -- 1925-1965 -- Political and social views 2 X-43A (Hypersonic plane) 2 X-ray microscopes 2 X-rays -- Diffraction 2 X-rays--Diffraction 2 X3D (Standard) 2 XPath (Computer program language) 2 XSLT (Computer program language) 2 XX (Group of artists) 2 Xenarthra 2 Xenobiotics -- Metabolism 2 Xenophon 2 Xenophon. -- Hellenica 2 Xhosa 2 Xhosa language 2 Xhosa literature 2 Xi Xia Dynasty (China) 2 Xikrin Indians 2 Xin (The Chinese word) 2 Xinca language 2 Xinjiang Uygur Zizhiqu (China) -- Ethnic relations 2 Xinjiang Uygur Zizhiqu (China) -- History -- Autonomy and independence movements 2 Xylem 2 X Window System (Computer system) 1 X chromosome -- Abnormalities 1 X, Malcolm, -- 1925-1965 -- Juvenile literature 1 X, Malcolm, -- 1925-1965 -- Oratory 1 X, Malcolm, -- 1925-1965 -- Travel -- England -- Oxford 1 X, Malcolm, 1925-1965 1 X, Malcolm,-1925-1965-Drama 1 X-20 (Space glider) 1 X-Men films 1 X-Men films - History and criticism 1 X-Ray Technology 1 X-linked mental retardation 1 X-linked mental retardation -- Atlases 1 X-ray astronomy -- Textbooks 1 X-ray crystallography-Technique 1 X-ray crystallography.Macromolecules--Structure.Proteins--Structure 1 X-ray microscopy 1 X-rays -- Congresses 1 X-rays -- Diffraction -- Congresses 1 X-rays -- Diffraction -- Experiments 1 X-rays -- Diffraction -- Industrial applications 1 X-rays--Diffraction--Technique 1 X-rays--Industrial applications 1 XBRL (Document markup language) 1 XML 1 XML (Document markup language) -- Congresses 1 XML (Langage de balisage) 1 XNA Game Studio 4.0 1 XQuery (Computer program language) 1 XYZ Affair, 1797-1798 1 Xalanga (South Africa) -- Politics and government 1 Xalanga (South Africa) -- Social conditions 1 Xanthines 1 Xanthophylls 1 Xarxes d'ordinadors 1 Xarxes de comunicacions 1 Xavante Indians -- Anthropometry 1 Xavante Indians -- Health and hygiene 1 Xavante Indians -- Population 1 Xã hội học 1 Xbox video games 1 Xbox video games -- Social aspects 1