title: Two revolutions in learning.
authors.forename: Susan R
authors.initials: SR
authors.lastname: Singer
authors.forename: William B
authors.initials: WB
authors.lastname: Bonvillian
mesh_terms: D020375:Education, Distance; D006801:Humans; D020407:Internet; D007858:Learning; D009862:Online Systems; D012586:Science / Q000193:education; D013663:Teaching; D014495:Universities