3 hour
You do not (without invasive surgery) until the sex organs of the fetus can be seen using a scan or until the baby is born. Using surgery, a cell from the developing fetus can be taken and its DNA tested for the sex chromosomes present. The surgery presents risks both to the fetus and the mother.
Yes, there are conditions that cause people to be born without eyelids. They must continually receive eye drops until the condition can be fixed via surgery.
It would not be unheard of until the surgery has healed completely.
For the foreseeable future yes. Until we figure out how to stop the aging process, correct abnormalities and accidental damage without it.
If you had heart surgery you shouldn't drink alcohol until your surgeon says you can.
surgery remained a relatively crude science up until the early 1900s.
No, they diffuse until an equilibrium is established meaning there is an equal spread of the gasses molecules. - Tony
Collapsing matter and gasses get denser and denser until nuclear fusion and fission start.
after surgery? well you should wait a few days or weeks until you get back to your normal routine before you had the surgery
You should wait until you are off any medication relating to the surgery, and the wound from the surgery is visibly healed.
yes it was in practice and continue on until much later
air is separated through the process of fractional distillation this is where the gasses are cooled until they become a liquid. then the liquids are heated the lighter gasses boil first and evaporate then condense back into a liquid.