Astronomers have discovered a giant, spherical cavity within the Milky Way galaxy; its location is depicted on the right. A zoomed-in view of the cavity (left) shows the Perseus and Taurus molecular ...

Finally the liquid metal is removed, leaving just the channel and a spherical cavity ready to use as a mini-centrifuge, explained RMIT engineer and study co-leader Dr Khashayar Khoshmanesh.

Short-range attraction between the surfaces of the lock and key particles turns the complementary geometry of our simple building blocks—a spherical key fitting into the cavity of a lock—into ...