Researchers from the University of Pennsylvania have worked to optimize the use of coffee grounds in pour-over coffee and present their suggestions in Physics of Fluids. They recommend pouring from as high as possible while still maintaining the water’s flow. In particular, the group found the thick water jets typical of standard gooseneck kettles are ideal for achieving this necessary height and laminar flow. Displaced grounds recirculate as the water digs deeper into the coffee bed, allowing for better mixing between the water and the grounds, and thus, results in a stronger coffee with fewer beans.

A recent study led by researchers from Tsinghua University and Southwest University of Science and Technology has introduced a new method to directly regenerate heavily degraded lithium cobalt oxide [LiCoO₂ (LCO)] cathodes from spent lithium-ion batteries. Using a ball milling process to convert the damaged crystalline structure into a uniform amorphous phase, the team rebuilt lithium replenishment pathways and restored electrochemical performance through high-temperature sintering. The regenerated cathodes delivered a discharge capacity of 179.10 mAh·g⁻¹—comparable to commercial materials. This approach not only sidesteps the environmental and energy drawbacks of conventional recycling but also presents a scalable and economically viable solution for the reuse of retired battery components.