This replica of the body's blood factory is made entirely with human cells. Breakthroughs, discoveries, and DIY tips sent every weekday. Without even thinking about it, the bone marrow in your body is churning out billions of cells every single day. Bone marrow is our body's strong and silent "blood factory," working hard in the background while heart pumps and brain controls. The spongy marrow really gets attention during a blood cancer diagnosis or when this crucial system stops working properly.

An artist sneaked an AI-generated print on to a gallery wall before bemused visitors alerted museum staff. The print was hung up at National Museum Cardiff by secretive artist Elias Marrow, who said his Empty Plate piece - depicting a young boy in school uniform holding a plate - was viewed by a few hundred people before it was removed. One visitor who noticed the artwork asked a member of staff about it, but said the museum worker admitted they had no idea about the piece or when it arrived. An Amgueddfa Cymru spokesperson said: An item was placed without permission on a gallery wall in National Museum Cardiff. We were alerted to this and have removed the item in question.

Large language models (LLMs) are increasingly deployed in clinical decision support, yet subtle demographic cues can influence their reasoning. Prior work has documented disparities in outputs across patient groups, but little is known about how internal reasoning shifts under controlled demographic changes. We introduce MEDEQUALQA, a counterfactual benchmark that perturbs only patient pronouns (he/him, she/her, they/them) while holding critical symptoms and conditions (CSCs) constant. Each clinical vignette is expanded into single-CSC ablations, producing three parallel datasets of approximately 23,000 items each (69,000 total). We evaluate a GPT-4.1 model and compute Semantic Textual Similarity (STS) between reasoning traces to measure stability across pronoun variants. Our results show overall high similarity (mean STS >0.80), but reveal consistent localized divergences in cited risk factors, guideline anchors, and differential ordering, even when final diagnoses remain unchanged. Our error analysis highlights certain cases in which the reasoning shifts, underscoring clinically relevant bias loci that may cascade into inequitable care. MEDEQUALQA offers a controlled diagnostic setting for auditing reasoning stability in medical AI.