Portal 2 ’s very best gag comes at the start of the game, in its tutorial stages, and spins Portal ’s game-design satire into ...

Abstract: This paper presents a tutorial on the Tracking, Telemetry, and Command (TT&C) for spacecraft and satellite missions. In particular, it provides a thorough summary of the design of the TT&C, ...

January 13, 2026 • A historian of modern China, Jung Chang turns the lens back on herself in her newest book to understand how she sees the world and why she writes about China today.

Within each content area, there are one or more tutorials. Each tutorial consists of lessons. Each lesson should be a page detailing the concept being taught, along with sample code. Lesson and page ...

January 12, 2026 • The Trump administration will send hundreds of additional federal agents to Minnesota. And, here are the figure skaters who will represent Team USA in the Olympics.