Science This Victorian ghost book exposed spiritualist frauds with cool optical illusions Ellsworth Toohey
History A new digital archive contains 374 US-Native American treaties, available for the first time ever Thom Dunn
art New smartphone app lets museum visitors point at art, then see artists discuss the work Andrea James
art Major exhibition of Nam June Paik, "father of video art," opens at Smithsonian in December 2012 Xeni Jardin