By: Emily Matchar From: smithsonian.com Women eventually face the yearly ritual of the mammogram, usually suggested from age 50 onwards. It’s not painful, though notoriously uncomfortable, as two plates flatten the breasts, pancake-like, to get the best possible picture. The radiologist then looks at x-ray images for opaque spots that can indicate tumors. Mammography has been used since the late 1960s and is …