The Heart of Matter: Physicists are still asking, What's the universe made of? String theorists think they may know, and their new discipline is zeroing in on a theory of everything.

• Autores: Brian Greene
• Localización: Natural history, ISSN 0028-0712, Vol. 109, Nº. 1 (FEB.), 2000, págs. 80-82
• Idioma: inglés
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