According to the damage reason of the chemical reaction tower and the elementary test, this paper thinks the main factor to affect the safety of the tower is the stress in the work.

In fact, when several dozen elementary - and middle-school kids from the Detroit area used this exercise for 15 minutes a day, many showed significant gains on a widely used intelligence test.

Almost half of those who sat the exam were unable to solve elementary maths questions and a third failed a reading comprehension test.