A research team, including Professor Naoto Tomioka of Okayama University of Science, has uncovered new genetic evidence challenging the long-standing "dual-structure model" of Japanese ancestry. By ...

Diarrhea during your period is a relatively common experience. Commonly called "period diarrhea," it can occur because your body releases more prostaglandins during menstruation. Prostaglandins are ...

Late or missed menstrual period Late period: 5 or more days late compared to normal menstrual cycle Missed period: no menstrual flow for more than 6 weeks Teen not using any birth control that stops ...

Jade processing was in full swing by the middle of the Jomon period. People made tools ... Yayoi (10th century B.C. to 3rd century A.D.) and Kofun (3rd to 6th century) periods.