Natural fiber is a resource that is found abundantly and cost effective. It is decomposed easily and biodegradable. Natural fibers have a vital place in the industry and have the capability of replacing carbon fibers and conventional glass because of their biodegradability and eco-friendly characteristics. They have significant chemical, mechanical, and physical properties, which vary according to cellulose content in the fiber. Usually, with the increase in the cellulose content, the tensile strength of the fiber increases and with the increase in the non-cellulose content, the tensile strength of the fiber decreases. However, these chemical constituents are not the only factors that determine the tensile strength of the fiber. Certain other factors such as fiber age, maturity, location, and processing methods along with the source of the fiber also influence the tensile strength of the fiber. These properties of the natural fibers make it a vital component in engineering applications. Natural fibers meet the needs of humans and the manufacturing industry with their positive environmental effect and economic outlook. This review provides basic information and a segregated study on the mechanical properties of natural fibers, thus creating opportunities for future research and studies related to natural fiber–reinforced composites.

Robotics is a rapidly growing field, and the innovative idea to scale down the size of robots to the nanometer level has paved a new way of treating human health. Nanorobots have become the focus of many researchers aiming to explore their many potential applications in medicine. This paper focuses on manufacturing techniques involved in the fabrication of nanorobots and their associated challenges in terms of design architecture, sensors, actuators, powering, navigation, data transmission, followed by challenges in applications. In addition, an overview of various nanorobotic systems addresses different architectures of a nanorobot. Moreover, multiple medical applications, such as oncology, drug delivery, and surgery, are reviewed and summarized.