"It provides the propulsion that Orion needs to get us to the Moon."
Smart Machines - Gallery Lighting Strategies (Computerhistory.org)。关于这个话题，新收录的资料提供了深入分析
，推荐阅读新收录的资料获取更多信息
"It's stressful, you can get exploited, and then you can end up not just without any money, but sick and lonely."，更多细节参见新收录的资料
The honest answer: because it shouldn’t work and has never been done before. TeX has no arrays, no functions with return values, no convenient local variables or stack frames, no integers bigger than 2^{31}-1, no bitwise operations. Macro expansion can recurse, but you get no call stack and deep recursion quickly hits engine limits. What TeX does have is a Turing-complete macro expansion engine and, with e-TeX extensions (used by modern pdfTeX), up to 32,768 integer registers called \count. That turns out to be just barely enough to implement a chess engine.