Decades: 1690s BC 1680s BC 1670s BC 1660s BC 1650s BC - 1640s BC - 1630s BC 1620s BC 1610s BC 1600s BC 1590s BC
Significant People
... treatments 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 ...