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Re:A 5 Minute Intelligence Test for Kids by AGorilla on Tuesday September 01, 2009 @12:10PM (#798243)
But to do the tasks correctly, your brain is fundamentally making a series of comparisons, incorporating visual and haptic sensory information. The key here is that the white space of the cards prevents you from putting the two lines exactly next to each other.

What if you just hold the cars facing each other so the lines are just short of touching? Then you can see the lines pretty much side-by-side.

Yes, I am smarter than a fifth grader.

Re:A 5 Minute Intelligence Test for Kids by algorias on Tuesday September 01, 2009 @12:44PM (#798315)
If a five year old actually did that, wouldn't you think it's a clear indication of intelligence?
Re:A 5 Minute Intelligence Test for Kids by ektimo on Tuesday September 01, 2009 @05:10PM (#798966)
Or you could try using 2 other cards to draw a horizontal line across the 2 lines for comparison. One card is used to form the right angle and the other is used to slide up to see which line end it reaches first.

Or if you could get a good shadow you may be able to do it with just one other card with the 2 comparison cards aligned and the shadow card tilting down.

Edit: Or just use table corner. 2 cards along edge and line drawing card on other edge.