Fish don't always swim fast. If the fish is sick then you probably need to do a water change ASAP making sure that the replacement water is the same temperature as the old water to avoid temperature shock which can kill the fish.
Make sure that you have changed the water recently so that it is oxygenated.
Thee are special flakes labeled just for goldfish readily available at most stores.
Yes indeed they will. Most folks who have ponds with goldfish in place a cover of some sort to hinder/prevent the birds from getting their fish.
contrary to popular belief, most goldfish do not have a stomach!
Apparently you should start wearing a bra when you can place a pencil under your boob and it stays there without you holding it. Most people just buy them when their bobbs start growing.
Comet goldfish are the average pet, although you can now get funnier types such as (my favourite) Celestial goldfish.
Goldfish are very lovable because they often get attached to a particular owner that they see on a day to day basis. They most likely stare through the glass when you watch them or feed them, because they view you as some sort of "bringer of life". In fact, most fish do this, so it's not just goldfish.
Probably at places such as Nordstroms or Macys, and of course, online (probably the most convenient place).
A telescope eye goldfish is in the fancy goldfish type, and most fancy golddfish get up to a foot long (with proper care).
Most likely not. If there are goldfish, then there are definetely going to be predators. Goldfish are small, and one predator could eat about 5 goldfish. It's very unlikely, but possible.
That is most likely a string of feces hanging off of your goldfish. It will break off eventually.
It depends on the conditions. If all the goldfish were being starved (for example) most of them WOULD die. But if one just happened to die for no particular reason, then it probably won't affect the rest.
Goldfish are not aggressive fish. They most definitely do not kill people.