BIOS lets researchers fork an active research thread without losing where they started. Research rarely moves in a single direction. A finding opens two possible paths, a hypothesis splits into competing mechanisms, or a dataset suggests an analysis the original query did not anticipate. Previously, pursuing a second direction meant either overwriting the existing thread or starting over entirely. BIOS builds a persistent world state across every session. That context is what makes each subsequent step in a research session more informed than the last. Conversation branching duplicates an active research thread from its current state with the original staying intact. The copy carries the full persistent world state forward and accepts a new objective, allowing both directions to run independently from the same starting point. Every branch lets researchers carry the full research context forward.