The triangle doesn't bend because each side experiences only one force at a time. When used properly, triangles are the most stable and rigid shapes used in construction today.

Principal Investigator Dr. Firat Guder, from the Department of Bioengineering at Imperial College London, said, "Prosthetic limbs are often uncomfortable because they have a fixed rigid shape.

The artificial limb's fixed, rigid shape can't adapt to changes in a person's body, ultimately causing it to rub against a person's residual limb. "Ultimately, no matter how sophisticated the limb ...

The triangle doesn't bend because each side experiences only one force at a time. When used properly, triangles are the most stable and rigid shapes used in construction today.