eXist-db is an open source software project for NoSQL databases built on XML technology. It is classified as both a NoSQL document-oriented database system and a native XML database. Unlike most relational database management systems and NoSQL databases, eXist-db provides XQuery and XSLT as its query and application programming languages. eXist-db is released under version 2.1 of the GNU LGPL.

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REM Sleep May Exist to Heat Your Brain Up From The Inside

Healthy obesity doesn't exist; obesity is not a benign condition - study published in the Journal of the American College of Cardiology shows.

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With Better Communication, Astronomers and Satellites can co-Exist

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Carbon-Reduction Plans Rely on Tech That Doesn't Exist

Does dark matter exist? A provocative theory proposes a new rule of gravity

Quantum bits that exist in two time dimensions

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Reality doesn’t exist until you measure it, quantum parlor trick confirms

Dark Matter Doesn't Exist | Pavel Kroupa

How many knots exist? A new computing trick is untangling the answer

Dark Matter May Not Exist: These Physicists Favor of a New Theory of Gravity

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Does the Grand Civilization of the Inca Empire Still Exist Today?

Does dark matter really exist?

Do Trojan exoplanets exist?

What Is the Multiverse? Is It Just Science Fiction, or Does It Really Exist?