Fifth grade was when I first learned the difference between parallel and perpendicular lines. I still remember the worksheet ...

Parallel lines are lines that never cross each other - they keep the same distance apart from each other. When two lines intersect, the opposite (X) angles are equal. On parallel lines, alternate (Z) ...

B-Bars in my last several videos and received lots of comments asking if I can review them, so here you go, this is my ...

Transgenic plants have become attractive systems for production of human therapeutic proteins because of the reduced risk of mammalian viral contaminants, the ability to do large scale-up at low cost, ...