Some advantages of blended learning, particularly at a Kindergarten to grade 12 level of education, can be found under the general concept of educational technology. It is also one of the most effective ways for Personalized learning at scale.
The length of a human pregnancy can vary naturally by as much as five weeks. Credit: Â© Jessmine / Fotolia. The length of a human pregnancy can vary naturally by as much as five weeks, according to research published online August 7 in the journal Human Reproduction. Normally, women are given a date for the likely delivery of their baby that is calculated as 280 days after the onset of their last menstrual period.
Patients who become pregnant without any monitoring (ultrasound, ovulation prediction kit, basal body temperature, etc.) generally use menstruation to determine due date and age of the pregnancy. The average human pregnancy lasts 40 weeks from the first day of the last menstrual period to the day of delivery. This assumes that ovulation occurs 14 days after the first day of the period. Accordingly, this age, which is called gestational age, is 2 weeks greater than the embryonic age.