Many paper, cardboard, and box tests may be performed on one instrument, including crush, puncture, flexure, and tensile tests. Click here to learn more.

Even the smallest drop of water seems to weaken that pristine sheet forever. But why is paper so much easier to tear when it's wet? The answer comes down to the paper's chemical structure.

Charmin had been secretly letting customers test the new rolls. The company says the top customer complaint over the years has been the uneven tears from the square shape.

Charmin had been secretly letting customers test the new rolls. The company says the top customer complaint over the years has been the uneven tears from the square shape.