KSQD 12-20-2023: Cold weather increases the tendency to have atrial fibrillation; Help interpreting an abdominal ultrasound; Should my wife and I get the RSV vaccine? Brain implant device greatly improves mental skills in traumatic brain injury patients; Singing to your baby helps develop language development; Recalling memories as therapy for PTSD and other brain problems; Medical alert for hair products that or toxic only when heated; Deep dive into the immune system’s involvement in postpartum depression; Stimulation in the vagus nerve to help stroke recovery and Parkinson’s disease; Baby talk by parents to their infants is universal; Take breaks and walk if you have to sit long hours each day