Sam Altman calls current AI infra buildout the “biggest joint industrial project in human history.” Across the world, companies are building infrastructure with urgency: big tech spending hundreds of billions on data centers, semiconductor fabs investing as much in new capacity, energy providers signing multi-gigawatt power contracts to power AI clusters. The Scaling Era tells the stories behind this buildout. We talk to chip designers, roboticists, data center operators, and founders across the value chain—the builders whose efforts determine whether AI scales or stalls.