Egyptians were known for their advancements in all of the following except
a.
mathematics
c.
military strength
b.
herbalism
d.
astronomy

You can drink laxative, or  do this exercise when you are sitting in the bathroom on the toilet. to relieve  constipation  fast or in about 1 minute, pinch your nose after your usual exhalation. start holding your breath. but do not mouth breath during this just hold your breath.