It is Impossible
No. An egg is fertisilised by a single sperm that has fought its way through the wall of the egg. Once that sperm has entered the egg the cell wall become impervious to sperm. Sometimes the egg can split into two and this will cause identical twins. Fraternal Twins (non identical) are caused by two eggs being fertilised by two sperm
Yes, but not monozygotic twins. There are cases where a woman was impregnated by two (or more?) men very close in time to each other, and two ova were fertilized by different men. In that case black and white twins are quite possible.
Not at the same time to create a single baby. But it is possible that if the woman has two eggs then two different men can fertilize them, resulting in fraternal twins that are half-brothers.
No.
They both dressed as men, they both built many monuments, and they both ruled in the New Kingdom.
it means that different people can do the same thing at the same time
Every woman is a little different in this matter, but the average is about 28 days. That's not quite one calendar month, so a woman's periods will generally NOT correspond with the same day of each 30- or 31-day calendar month.
Two places in different hemispheres can have the same time if they are both in the same time zone. Time zones are defined by a range of longitudes, so places within that range will have the same time despite being in different hemispheres.
When you are over 21
You can certainly have your feet in two different countries at the same time.
Between 4-10 days. It's different for every woman.
For heaven's sake, I hope you don't think that there's any time in the operation of a man's body that he can't impregnate someone... with the possible exception of perhaps the first hour after he's already impregnated someone else. The only real schedule that needs to be tracked is the woman's ovulation. If the man is there in the room, then nothing else about him has any relevance to the calculation.
the sun sets at the same time