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.
The fact is that there are only a limited number of days each cycle when a woman can get pregnant - the five days before she ovulates and the 24 hours after she ovulates. These six days are the only fertile days of a woman's cycle and they take into account the lifespan of sperm (5 days) and the lifespan of the ovum (24 hours).