UK startup Pulsar Fusion is developing a revolutionary nuclear fusion rocket engine, promising to halve the travel time to Mars as compared to SpaceX's Starship. The project leverages artificial intelligence and nuclear fusion to transform our understanding of interplanetary travel. Meanwhile, Twitter is embroiled in a regulatory spat in San Francisco over its rebranding efforts, which saw a giant "X" sign unceremoniously removed from its headquarters due to permit violations. These events underline the challenges and breakthroughs faced by innovative companies, be they in reshaping space travel or in navigating local regulations while redefining brand identities.