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Image - In this image, an optically excited spin-singlet state (red), which features electron-hole pairs, splits into a pair of spin-triplet states (blue). The individual triplets have equal and opposite center-of-mass momenta – they behave like waves moving in opposite directions along a crystal. The gray and white spheres represent carbon and hydrogen atoms, respectively. (Credit: Florian Brown-Altvater/Berkeley Lab) Image - An X-ray study revealed the size and distribution of tiny pockets of water in fibrous fuel-cell components at different temperatures. (Credit: Berkeley Lab)