True. Would you mind to tell that many well known facts are known to what % of people? Rice ball directly or on old clean cloth was the only one method known to many women in villages. While in North India where Potato grows may know that, but not in South India. I did not know until I was in the North. So "well known" facts to a few may not be well known to masses. Customs evolves and spreads. The point was not if well known. rather was it used always? Coffee waste is a fertilizer to Roses, do every one knows it? Leaf of a plant - Aadu toda palai" which is used in Park Davis Derp Vosaka cough syrup is a well known fact to how many? Only when I contact Park Davis they asked me "how did you know this" . I told them my grand mother used this when we had caught". In my village many did not know this. So, the idea is when some one shares and idea, it becomes a tool to solve some problems, hat is the gist of it. Unfortunately, when writing this much clarity does not come. Thus, our statements are context sensitive. I am not defensive, rather trying to share what I had learnt. Apple was falling is a well known fact, why should we give credit to Sir Issac Newton? To expressed the science behind that.
The tribals in my country plant Lemon grass to keep away mosquitoes..hence we now have commercial lemon grass extracts mosquito repellent.
Young papaya leaves are crushed and the juice is used as a meat tenderiser..and in medical science the same extract which contains papain is used to decrease swelling.
If a curry is too chilli hot add tamarind juice or lime juice to decrease the chilli hot effect.
Kaffir lime is cut into halves and put at window sills as an air refreshner
Crushed guava leaves are crushed and used to ward off rodents.
Coffee waste and used tea leaves are used as organic fertilizers..again not an unknown fact.
Its so common out here.
Rose hip is used as treatment in western herbal cough syrups along with ivy leaves extract.
There is a type of ginger here called Halia Bara(Red ginger) which has a very hot heaty feel to it when made into a juice..used for joint pains and problems with wind in the body, for sinusitis etc..not to be taken often cos its very strong on the gut.
So you see..none of us know something that others dont always know.
What we know another might not know and what others know we might not know.
Most important fact is none of us are discovering anything..we are just recycling information.