December 21 has been designated World Meditation Day by the United Nations. The practice can change not only our bodies, but ...

The Ninth Doctor introduced the deadly energy weapon known as the Delta Wave in "The Parting of the Ways". In "The Interstellar Song Contest", Kid plans to use the Delta Wave for mass destruction, ...

When two tones of slightly different frequencies are played in separate ears simultaneously (usually through headphones), the human brain perceives the creation of a new, third tone, whose frequency ...