The Meta Ray-Ban Display glasses cost $799 and feature a screen in the right lens that lets you navigate maps and view your camera feed, messages, translations, Meta AI responses, and more.

Injection molding seemed easy—until I tried machining a double convex lens mold. From surface finish to mold alignment, this “simple” project got real fast.

Abstract: We report a procedure to design fixed-structure strictly negative imaginary (SNI) controllers for collocated, highly resonant systems based on frequency response data. We formulate the ...