Do you know something that you wish you didn't?

Answer 1

Yes I know way too much about sex especially for someone who has never had sex.....

Answer 2

In nuclear medicine it is very important to know about the half-life, t1/2, of the radioactive substance in question. All radioactive substances are by definition unstable. When unstable forms (= radioactive isotope) of an element (atom) decay into stable forms (= stable isotope), they do so by releasing energy (radiation) and/or particles. The rate at which this decay occurs is called the half-life - i.e. the time required for half of the atoms of a radioactive substance present to become disintegrated. The half-lives vary greatly. Some radionuclides have a half-life of only a few seconds, while others may have a half-life of several thousand years!
Radionuclides with a very short t1/2 are not very useful for NM, because by the time they have been produced, dispensed in patient dosages and sent to a hospital, they will have decayed almost completely into stable nuclides. In order for such nuclides to be useful in medicine, they would have to be supplied in such large quantities that they would still retain sufficient radioactivity when it was time for them to be used in the patient. This would obviously be costly, because much material would go to waste during production and transportation, and it would also involve a higher risk of radiation exposure for the people engaged in producing and transporting the substance.

The other extreme is not desirable, either. For long-lived nuclides, the decay occurs so slowly that there is hardly any measurable radioactivity available to produce an image in the patient. Moreover, their use could also involve a certain risk for the patient. If the body has no natural mechanism for ridding itself of a given isotope, it may be retained within the body. It is for instance not uncommon that a radionuclide can accumulate in the liver, where tissue and cells can be damaged because it emits small amounts of radiation for many years.
For use in medical diagnostic procedures, therefore, a radionuclide should have neither too short nor too long a half-life. Most of the nuclides we supply have a t1/2 of from 12 hours to 2-3 months. However, one of our nuclides has a half-life of only 13 seconds (krypton gas, inhaled for lung scans), and perhaps the most important of all, technetium, has a half-life of only six hours. We will explain more about technetium later on.

Answer 3

oh ya. I was at my aunts house and she has a very large collection of movies. She said i could borrow some and i started looking through them. I looked behind the TV and found a PORNO movie!!! The cover has a naked women on the front....now i think my aunt is gay or something....but we are catholic so...um ya I REALLY wish i didnt know that!!!

Answer 4

I wish I were stupid and ill-informed about world events and politics. That way, I could be like every naive citizen who keeps voting for people based on what they say in political ads or speeches. I could be stupid and it would not matter because I would no know any better.

Answer 5

yes and that would be the fact that my bed that was given to me 2 months ago my brother says he had sex with his girlfreind on it. Naw that is somethin i wish i didn't know cus i sleeep in that bed. After that day i put a lock on my door.

Answer 6

I know lots of things I wish I didn't.

Answer 7

Yes - that my neighbor (a woman) is having an affair with someone. Everytime I see her husband I can't even look at him - I feel bad knowing about it and him having no idea. It's horrible.

Answer 8

After watching the movie Blood Diamond, yes. Makes it hard to ever buy diamond jewelry for anyone after seeing that movie.

Answer 9

YES! I saw something last weekend, that I wish I never saw.

Answer 10

Yes. I found the instant messages my then-bf was sending to his new woman, referring to me as a danger to their relationship. The name-calling and putdowns had me in deep depression for months. I would have just rather he had told me he had found someone new and not made me go looking to find out.

Answer 11

Right after my ex-girlfriend dumped me she got drunk and had sex with my friend to spite me. She later told me JUST to upset me. She has gained a bunch of weight though and dropped out of community college to work two jobs since, so I got the last laugh.