False.
The intradiscal pressure of the L4-5 intervertebral disc while lying supine (face up) is 0.1MPa, while sitting relaxed in chair is 0.46. That's only 4.6x greater. This is from the latest research done in 1999.
Earlier research from the 1960's showed higher intradiscal pressures while sitting, but this was done with less sophisticated technology and still wasn't 11 times higher.
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true
Is it 12
4 people seated on a row may have 4! = 4x3x2x1 = 24 different ways to sit.
7!
because that will equal 22 nice even rows of 6 students