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Physicist John Wheeler proposed to Richard Feynman in a 1940 phone call that every electron and positron in existence could be a single particle tracing a tangled path back and forth through time. Sections of this path moving forward in time appear as electrons, while sections looping backward appear as positrons. Physicist E. C. G. Stueckelberg independently arrived at a similar concept around the same period.
AI chipmaker Positron secured $875 million in new funding, backers including NEA, Atreides Management, and Jim Clark, valuing the startup at $5 billion. The company designs specialized chips aimed at running AI models quickly, positioning itself against dominant GPU providers as demand for inference-focused hardware grows.
Physicists at the Beijing Electron Positron Collider II presented new analysis showing the particle X(2370) is likely a glueball, an exotic particle theorized nearly 50 years ago to be made entirely of gluons rather than quarks. The findings, detailed in a preprint shown at a physics conference in Brazil, build on 2024 work that measured the particle's mass and spin, now adding data on its decay modes and flavor-singlet structure.