 Abstract micro-needles, MNs, are small devices that can be used for a variety of purposes ranging from medical treatments to environmental monitoring. They offer several advantages over traditional methods such as being less expensive, more comfortable, and easier to apply. Additionally, they can be made out of different materials and can be customized to fit specific needs. MNs have been used in a number of applications, including drug delivery, diagnostics, and tissue engineering. This article was authored by Ruan Omar, Yubin Zheng, Jing Wang, and others.