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Tullio Levi-Civita
Tullio Levi-Civita, (29 March 1873 – 29 December 1941) was an Italian mathematician, most famous for his work on absolute differential calculus (tensor calculus) and its applications to the theory of relativity.
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29 March 2020
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Thirty-five countries and over 370 cities join Earth Hour for the first time29.3.2008
Wikipedia (12 Mar 2013, 11:40)
Thirty-five countries and over 370 cities join Earth Hour for the first time.
Earth Hour is a worldwide event organized by the World Wildlife Fund (WWF) and held towards the end of March annually, encouraging households and businesses to turn off their non-essential lights for one hour to raise awareness about the need to take action on climate change. The event, conceived by WWF and Leo Burnett, first took place in 2007, when 2.2 million residents of Sydney participated by turning off all non-essential lights. Following Sydney's lead, many other cities around the world adopted the event in 2008. Earth Hour 2013 will be held on March 23, 2013 from 8:30 p.m. to 9:30 p.m., at participants' local time.
Earth Hour is a worldwide event organized by the World Wildlife Fund (WWF) and held towards the end of March annually, encouraging households and businesses to turn off their non-essential lights for one hour to raise awareness about the need to take action on climate change. The event, conceived by WWF and Leo Burnett, first took place in 2007, when 2.2 million residents of Sydney participated by turning off all non-essential lights. Following Sydney's lead, many other cities around the world adopted the event in 2008. Earth Hour 2013 will be held on March 23, 2013 from 8:30 p.m. to 9:30 p.m., at participants' local time.
