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Homeopathy is a form of alternative medicine. It was created in the 18th century by Samuel Hahnemann. The basic theory behind Homeopathy is that a sick person can be healed using something that produces the symptoms of the illness in a healthy person. There is no reason to think this is true. Some people say that there is scientific evidence that homeopathy helps in many problems and diseases but scientists say they are wrong and that homeopathy only makes people think they feel better (this is called the "placebo effect.")
Homeopaths make their "medicines" by taking the thing they think will cure people, adding lots of water, and shaking the mixture. They then take a drop of the mixture, throw the rest away, and add lots more water. They do this usually 30 times but sometimes up to 200 times. They call it "potentisation". Hahnemann said this would bring out the "spirit-like medicinal powers held within a drug". Homeopaths believe that the solution carries a "memory" of the original substance, but according to science, it is really unlikely that this memory exists or that homeopathy will help people's health.
Science shows how many atoms or molecules - tiny things that cannot be divided up any more - existed in the original substance being diluted. In most homeopathic drugs, scientists can use mathematics to show they are unlikely to have any of the original substance. Even some homeopaths agree with this, but say that quantum mechanics or other things allow homeopathy to work anyway. A famous scientists called Professor Jim Al-Khalili said "Let me make this very clear: if you think QM (quantum mechanics) allows for homeopathy [...] then you'd better take a proper course in QM". Most scientists ignore homeopathy or say that it does not work, because its ideas go against those of physics and chemistry.
Homeopathy became popular because it was created at a time when medicine did not work very well and could make people sicker. Back then, taking homeopathy, might have kept people from getting hurt by bad doctors. However, medicine has improved since then, and now helps people a lot more than it hurts people. So while most people think using homeopathy won't hurt you, if you go to a homeopath instead of a qualified medical doctor, it may keep you from getting help that could save your life. Homeopaths have also been known to tell their patients not to take medicines like antibiotics and vaccines that could cure (or keep them from getting) dangerous diseases.
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