b'Surgeon Moustafa Hassan, MD, tells why some doctors are rethinking appendectomies Surgeon Moustafa Hassan, MD, tells why some doctors are rethinking appendectomies. . Tick-borne disease expert Brian Leydet, PhD, talks about ticks and the illnesses they spread Tick-borne disease expert Brian Leydet, PhD, talks about ticks and the illnesses they spread. . Registered dietitian nutritionist Maureen Franklin gives advice for eating well across the lifespan. Registered dietitian nutritionist Maureen Franklin gives advice for eating well across the lifespan.'