Frontiers of Science

Abstract

A compilation of popular science and technology articles on the development of a sodium battery with higher energy density and durability; the behavior of electrons in a quantum metal; a smart hydrogel for the automatic release of insulin; post-video-game depression; the long-distance migrations of humpback whales; the identification, via remote sensing, of ancient irrigation networks in the Kingdom of Urartu; and an indoor positioning system based on Wi-Fi networks.