This is the heart-warming moment a black swan was spotted feeding a koi fish. The video, recorded on June 14, 2025, in Zhejiang, China, shows the elegant bird standing at the water’s edge, retrieving ...

This is the heart-warming moment a black swan was spotted feeding a koi fish. The video recorded on June 14, 2025, in Zhejiang, China, shows the bird on the water’s edge go to retrieve food and feed ...

To enhance the photothermal response capability of phase change materials (PCMs), this study adopted a simple and efficient electrostatic self-assembly polymerization method. Using paraffin wax (PW) ...