Anchor: But after the Crusade of Pisa (see page 19), Islamic power waned, and in the early 13th century Ibiza was embraced by the Christian Reconquest.
Entailed: The Christian Reconquest had taken over 13th century Ibiza.
Contradiction: Christian Reconquests never reached Ibiza.
Contradiction: Soon there will be enough time and resources for man to make the first attempt at space travel. 
Contradiction: Imagine the United States could maintain gross national saving at its 2000 GDP share of 18.
Contradiction: Nobody is sitting
Contradiction: The aqueduct was used for 100 generations.