How this thing happen and can be prevented?
125033
It's a form of underwater swimming
461864
I think whatever floats your boat!!!\n   just make sure you use protection
452789
it is caused by vitamin and calcium defieciency. What you could do to prevent it is give them some bits of clam shells or egg shells.
648752
Okay, yes a virus can be prevented, if you have the right set of software\nnow the other questions are hard to explain...
536676
That happens once in a while.  It's nothing to be afraid of.  If it's happening repeatedly, or moves in more than one direction, then you may have a virus, but if it only moved once in one direction, ignore it.
86812
It's just a coincidence.  Unfortunately, things like that happen to people all over the world, every day.  Nothing you say or do can make that more or less likely to happen to anyone.\nIt's a shame that it happened, but it is NOT your fault.
137431
it is funny how dangerous a computer can be. I would tell your wife what happened because it sounds like you or someone who used the computer (maybe the kids) went to a site or did a search that allowed that message to get through. \n\ndont ever reply back because it wont stop. \n\ntry getting a block on the computer, it might help.
559385
It's called paranoia and it's there for a reason.  Don't be so stupid next time and USE A CONDOM.
487797
lol what's happening? you just told us! \n\nthe only way to stop this is to STOP IT. nobody can do it for you, i'm sorry to say. just stop snacking and remember your goals. k?
587068
You are trying to hard. Just relax, if it happens, it happens.
497843
That sort of thing rarely happens and it can happen at anytime.  Remember that there were medicines that contained poison a few years back?   I think one was tylenol.\n\nWhere I live, there are tons of kids trick or treating every year.
656226
You're forgiven!\nJust don't let it happen again! ;0)
435620
Hmm...\nThis is not a question. Please review the Community Guidelines to prevent further Y! Answers disasters.
253773
as far as i know it happens due to circulatory antibodies,..so it s not going to recur,..check again w someone else also,..hope this helps,..
405109
If you are asking, then someone else has thought of it, and it has probably occured.  The real challenge would be to be able to identify cases where it occured.  That is way beyond my technical expertise.  Quite an interesting question!
181840
Go in now.  It could be something very serious and it could be nothing.  Don't take a chance.
657719
it can happen not unusual