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Halloysite nanotubes (HNTs), which are geometrically similar to multi-walled carbon nanotubes, can improve the impact strength of epoxy substantially.In order to understand the roles of nanotubes during the deformation and fracture of nanocomposites, a state-of-the-art transmission electron microscope (TEM) with a bending stage was used to measure the Youngs modulus of individual HNTs.TEM micrographs showed that the HNTs were surprising flexible and could be bent to almost 90° without fracture.There was no observable reduction in the cross-sectional area of the bent HNTs.