Who were the scientists that have helped us to use electricity?

How have scientists and inventors helped us to use electricity safely?

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What is it like to live in Sao Paulo?

Sao Paulo is one of the biggest and wealthiest cities in Brazil. Try walking around one of the richest parts of the city:

https://www.google.co.uk/maps/@-23.606446,-46.702673,3a,75y,305.17h,120.24t/data=!3m4!1e1!3m2!1sZ2wPQS-8aQouGg4MZhFTRQ!2e0?hl=en

 

Now explore one of the favelas:

 

https://www.google.co.uk/maps/@-23.607488,-46.700461,3a,75y,298.11h,91.5t/data=!3m4!1e1!3m2!1sTWdasUfC9s2xkhEWeFNE6Q!2e0?hl=en