1) What is the name of the behavior where a material specimen thins out when the material deforms under tension,
or, vice versa, the material thickens when deformed under compression. Include the full name of the scientist after which this effect was named.
2) Explain the difference between the stiffness (k) and the modulus of elasticity (E), also known as Young's modulus.
3) When Dr. Armanios rolled the sheet of honeycomb material, the material did not roll into a cylindrical shape but instead bent into a saddle shape . Explain why this happens from basic properties and characteristics of solid materials.