These are some great DIY projects that you can do for cheap.

Abstract: This article presents a novel inductive sensor system that can simultaneously measure linear and angular displacements. The proposed sensor system aims to mitigate the drawbacks of existing ...

Diagnosis and management of atopic dermatitis, a type of eczema, are complicated by skin temperature fluctuations, unclear ...

These are the projects I recommend building instead of just buying something off the shelf.