Einstein's two mistakes

Scientific research is based on the relationship between the reality of nature, as it is observed, and a representation of this reality, formulated by a theory in mathematical language. If all the consequences of the theory ...

Scientists produce radioactivity-free Chernobyl vodka

A team of British scientists has helped produce a radioactivity-free vodka called "ATOMIK" from crops near the site of the 1986 Chernobyl nuclear disaster, the University of Portsmouth said on Thursday.

Six things to know about NASA's Opportunity Mars rover

After 15 years, the mission of NASA's Opportunity rover has come to an end, but its successes on Mars have earned it a spot in the robot hall of fame. Here's what you need to know about our intrepid Martian overachiever:

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Spirit

The English word "spirit" has many differing meanings and connotations, but commonly refers to a supernatural being or essence — transcendent and therefore metaphysical in its nature: the Concise Oxford Dictionary defines it as "the non-physical part of a person". For many people, however, spirit, like soul, forms a natural part of a being: such people may identify spirit with mind, or with consciousness, or with the brain.

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