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-- Astrophysicist Hugh Ross.
-- John O'Keefe, astronomer at NASA.
-- Paul Davies, British astrophysicist.
-- Abraham Lincoln; adapted.
-- Nobel laureate Arno Penzias.
-- Albert Einstein.
-- Arthur L. Schawlow, Professor of Physics at Stanford University,
1981 Nobel Prize in physics.
-- George Greenstein, astronomer.
-- Author unknown.
-- Aaron Arrowsmith.
-- David Brandt Berg.
-- Author unknown.
-- Viola Walden; adapted.