From red light therapy to retinol, a dermatologist examines the evidence behind the staples promising a brighter complexion When mathematician and science writer Hannah Fry appeared on the Table Manners (with Jessie and Lennie Ware) podcast recently, declaring, “I science the s--t out of my skincare,” listeners sat up and took note. From LED to Botox and retinol, her visi... [5885 chars]