Pyotr Ilyich Tchaikovsky 1840 – 1893 was a Russian composer of the Romantic period. He was the first Russian composer whose music made a lasting impression internationally, which was bolstered […]

Pathfinder’s Office Hours at the Science Circle   Are you interested in immersive learning, art and education in virtual worlds? Want to join an engaging discussion with a roundtable of […]

Solar Sierra and Windy Schor represent EnergyTeachers.org in Second Life, building virtual objects for exploring real-life technologies, and holding meetings and discussions between educators and interested people. Windy uses the somewhat realistic wind that blows through Second Life regions to develop methods for gathering statistics about wind, and for modeling wind power systems. Solar builds […]

The Cantor Bernstein Schröder Theorem of Set Theory   The EQUIVALENCE THEOREM (a.k.a. Bernstein-Schröder Theorem) Modern set theory originated between 1874 – 1884 from the researches of Georg Cantor at Universität Halle, Germany. Around 1895, Cantor presented the EQUIVALENCE CONJECTURE: Given sets A and B, if A is equivalent to a subset of B and […]