The use of the birthing chair or similar devices has been seen around the globe, not isolated to a particular region. The birthing chair can be traced to Egypt in the year 1450 B.C.E. Pictured on the walls of The Birth House at Luxor, Egypt, is an Egyptian queen giving birth on a stool. It can also be traced to Greece in 200 B.C as it is featured on an ancient Grecian sculpted votive.
Water weighs 64 pounds per cubic foot and there are 27 cubic feet in one cubic yard. So a cubic yard of seawater weighs 1728 pounds. The original VW Beetle weighed only 1650 pounds! If that seems hard to believe, consider that 1 cubic foot is almost 7.5 gallons, and a cubic yard is more than 201 gallons.
A cubic yard is equal to 27 cubic feet. One cubic foot holds about 7.5 gallons. So, the box above can hold over 200 gallons of liquid -- assuming it is waterproof and won't leak all over the place. If you wish to know how much a cubic yard of dirt weighs, well, that's another kettle of fish.