‘Starter packs’—curated user lists that new users can follow with a single click—played a key role in helping Bluesky grow to over 30 million users, according to a new study.

B₄C–TiB₂ composite ceramics, with their unique integrated design of structure and function, have demonstrated remarkable potential in extreme environments, such as ultrahard wear-resistant applications and high-temperature electromagnetic shielding. However, the inherent brittleness of ceramics presents substantial machining challenges for fabricating complex geometries, significantly restricting their practical implementation. The development of robust joining technologies thus represents a critical pathway toward manufacturing large-scale and intricately shaped B₄C–TiB₂ architectures. To date, no studies have been reported on joining B₄C–TiB₂ composites, making this a vital yet unexplored research frontier. Addressing this gap holds tremendous potential to broaden their industrial applicability and pioneer novel advancements in advanced ceramic engineering.

University of Michigan researchers have uncovered new details of the process that HIV uses to hijack cells' transportation systems for its own survival.