After blocking estrogen signals in brain, experts say they’ve ‘never seen bone this strong’ UNIVERSITY OF CALIFORNIA – SAN FRANCISCO IMAGE: BONES LIKE THE FEMUR (THIGH BONE) NORMALLY BECOME WEAK AND POROUS IN AGING MICE (71 WEEKS, LEFT), BUT AN EXPERIMENTAL CHANGE IN BRAIN SIGNALING LED TO MUCH DENSER AND STRONGER. CREDIT: CANDICE HERBER / UCSF...