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| ‘Natural substances’ and a natural woman | ‘Natural substances’ and a natural woman |
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| Irrespective of the safety or otherwise of glyphosate, the idea that “natural substances” are not chemicals and are consequently inherently safe is curiously persistent. Indeed Craig Sams’ letter (15 August) mentions the hazards of (natural) tobacco leaves. Biochar will unavoidably contain polycyclic aromatic hydrocarbons, formed “naturally” in charring processes, which are known carcinogens. But just don’t eat it (or inhale it).Jonathan ClaydenProfessor of chemistry, University of Bristol | Irrespective of the safety or otherwise of glyphosate, the idea that “natural substances” are not chemicals and are consequently inherently safe is curiously persistent. Indeed Craig Sams’ letter (15 August) mentions the hazards of (natural) tobacco leaves. Biochar will unavoidably contain polycyclic aromatic hydrocarbons, formed “naturally” in charring processes, which are known carcinogens. But just don’t eat it (or inhale it).Jonathan ClaydenProfessor of chemistry, University of Bristol |
| • So John Brennan has had his security clearance removed for “lying” and his “erratic conduct and behaviour” (Ex-CIA boss says Trump denial of Russia collusion is ‘hogwash’, 17 August). Who said the Americans don’t understand irony?Cherry WestonWolverhampton | • So John Brennan has had his security clearance removed for “lying” and his “erratic conduct and behaviour” (Ex-CIA boss says Trump denial of Russia collusion is ‘hogwash’, 17 August). Who said the Americans don’t understand irony?Cherry WestonWolverhampton |
| • For one of the greatest performances ever put on film, look up Aretha Franklin at the Concertgebouw, Amsterdam, in 1968. Her rendition, alone at the piano, of Dr Feelgood, is beyond compare.Roger OsborneScarborough, North Yorkshire | • For one of the greatest performances ever put on film, look up Aretha Franklin at the Concertgebouw, Amsterdam, in 1968. Her rendition, alone at the piano, of Dr Feelgood, is beyond compare.Roger OsborneScarborough, North Yorkshire |
| • Our springer spaniel, Roxy, also causes amusement on her visits to the vet (Letters, 17 August). You can quickly spot the EastEnders’ fans when the tannoy requests Roxy Mitchell to go to room number two.Fr Alec MitchellManchester | • Our springer spaniel, Roxy, also causes amusement on her visits to the vet (Letters, 17 August). You can quickly spot the EastEnders’ fans when the tannoy requests Roxy Mitchell to go to room number two.Fr Alec MitchellManchester |
| • A friend acquired a new kitten just before the World Cup final of 1986, and decided that the cat would be named after the scorer of the winning goal. So Burruchaga it was…Tom LockeBurntisland, Fife | • A friend acquired a new kitten just before the World Cup final of 1986, and decided that the cat would be named after the scorer of the winning goal. So Burruchaga it was…Tom LockeBurntisland, Fife |
| • Join the debate – email guardian.letters@theguardian.com | • Join the debate – email guardian.letters@theguardian.com |
| • Read more Guardian letters – click here to visit gu.com/letters | • Read more Guardian letters – click here to visit gu.com/letters |
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| Aretha Franklin | Aretha Franklin |
| Brief letters | Brief letters |
| John Brennan | John Brennan |
| Donald Trump | Donald Trump |
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