UPDATE September 16, 2014: Crazy things in textbooks aren't just limited to the field of social studies. A new report found some pretty crazy things on the subject of climate change as well.
It seems the Texas education system is still nursing a hangover from the State Board of Education's raucous culture-warrior party days. Hell, it's possible they're still drunk. A while back in 2009 members of the SBOE tried to cut the actual science from the state's science standards (namely, Darwinian evolution, go figure.) Then they came back ready to swing for the fences, passing social studies curriculum standards that even a conservative think-tank called a "politicized distortion of history" driven by the evangelical Christian-right agenda."