Decades: 1220s 1230s 1240s 1250s 1260s - 1270s - 1280s 1290s 1300s 1310s 1320s
Years: 1266 1267 1268 1269 1270 - 1271 - 1272 1273 1274 1275 1276
Births
Deaths
... persist for a variety of reasons: The placebo effect. Medicines or treatments, known to have no effect on a disease, can have major effects on a person's ...