what is the most dangerous substance on the planet

Question: what is the most dangerous substance on the planet
- Keywords:
  dangerous,
  planet,
  substance
Asked by 326nepk48 to Ed, Kerrianne, Nina, Oli, yoyehudi on 6 Nov 2017. This question was also asked by Amie.
- Oli Wilson answered on 6 Nov 2017:
  
  Potentially botulinum toxin: a couple of teaspoons of it would kill everyone in the UK. A couple of kilos would kill everyone on Earth.The amount needed to kill a guy like me weighs less than a cubic millimetre of air. And people pay money to have it injected into their faces: it’s botox.
  (Those amazing numbers from http://www.bbc.co.uk/news/magazine-24551945)

673nepk25 commented on 6 Nov 2017:

WOW!

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357nepk25 commented on 6 Nov 2017:

that sounds very dangerous! but couldnt people who have botox die?

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- Oli commented on 6 Nov 2017:
  
  Oh absolutely! Edward and I had a go at answering this in more detail here: ////neptuniumn17-zone//2017/11/06/can-you-die-from-having-botox/
  
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Question: what is the most dangerous substance on the planet