I've been down with the common cold for about a week now. All the symptoms, sneezing, coughing, body ache, head ache, even fever. So if cold is so common that many of us get sick from it every time the temperature changes, why is there no perfect cure?
The reason is that the cold virus mutates every time. It means that if we create a cure for it one time. The next strain of virus will be immune to it. Nature is so interesting that it has given resistance to every living being on this planet. It is like we get inoculated against viruses like polio, hepatitis and stuff, in which we actually allow our body to be attacked by a small dose of them. The common cold virus is smart enough to mutate.
So how to protect ourselves from the common cold? As they say prevention is better than cure. It may sound stupid to receive advice from a guy who throws caution to the wind in such matters but best way is to restrict cold water intake and to drink purified water. And even after this if we get a cold, as we will, the best way is to expect it to remain for a week. So get your handkerchiefs and tissue papers out. Rest and chicken soup can help a lot. Chicken soup contains a mucus-thinning amino acid (got that from the internet :D). Nasal decongestants can be used to get relief from a blocked nose (like I am having right now).
Oh, I forgot there is another way to get relief from the common cold. Share it with your enemies (or friends) with a handshake ;P