Tethered headsets are physically connected to the laptop or computer. It is a much more complex system that gives an ultimate VR experience. The VR headset for iPhones works pretty well with iPhone, giving the user an awesome virtual reality experience.
DHA (docosahexaenoic acid) is an omega-3 fatty acid often recommended to women during pregnancy. Thought to protect against a number of pregnancy-related complications, DHA is also said to promote the health of the developing child.
Adults need to get DHA from food, and a baby in utero needs to get these fats from its mother. Newborns get DHA from breast milk or from baby formula supplemented with DHA. It's so important that even if a mother doesn't consume much DHA, her body will use its own reservoir of DHA to provide it to her growing baby during gestation and then through breast milk after birth.