evidence: Misleading: Barium salts are not 10,0000 more toxic for the nervous system than lead. Although some barium salts are toxic, their toxicity is comparable to lead. The claims that aeroplanes are deliberately depositing chemicals in the sky in chemtrails containing barium salts 10,000 times more toxic than lead are taken from a four hour long lecture by self-proclaimed prophet Dr Bill Deagle at the Granada Forum in 2006. The snippet has been posted multiple times on social media including Facebook, where one post received over 37,000 likes and 33,000 shares in March 2023. [...] As for the claim that barium salts are 10,000 times more toxic than lead, this exaggerates the toxicity of barium salts. Some salts such as barium sulphate are insoluble and not readily absorbed. They are used as contrast agents for medical images, for instance to make x-rays of the gastrointestinal tract clearer. Over exposure to barium salts can lead to "vomiting, abdominal cramps, diarrhoea, difficulties in breathing, increased or decreased blood pressure, numbness around the face, and muscle weakness"[5,6] and excessive quantities can be fatal. However the toxicity does not grossly outweigh that of lead[7] as suggested in the video.