Forty years ago, an Atlantic crossing required four engines because twin-engine certification kept you within an hour of a diversion airport. Today twin-engine 777s and A350s fly six hours over open ocean, and three- and four-engine widebodies are nearly extinct. We walk the ETOPS framework, the engine-reliability math behind it, the route history that opened up, and the honest reason economics finished the job certification started.
Certification
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Why Airliners Are Twin-Engine Now -
The Science of Learning for Technical Skills Why rereading and tutorial-following feel productive while teaching you almost nothing: the testing effect, the actual Ebbinghaus math behind spaced repetition, interleaving, Bjork's desirable difficulties, and what deliberate practice really means for engineers — plus an Anki workflow for certs and new stacks that survives contact with a real on-call schedule.
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The Complete CCNA 200-301 Study Guide: Every Topic, Linked A single map of the entire CCNA 200-301 (v1.1) exam blueprint — all six domains from Network Fundamentals to Automation and Programmability — with every exam topic linked to an in-depth post that covers it. Use this as the index to the whole CCNA series: subnetting, switching, VLANs and trunking, spanning tree, OSPF, NAT, ACLs, DHCP/DNS/NTP, wireless, first hop redundancy, security, and network programmability, plus an honest note on what is in scope, what changed in v1.1, and how the domains are weighted.