Villarreal's president Fernando Roig (L) and new coach Chilean Manuel Luis Pellegrini (R) arrive for Pellegrini's presentation, in Madrigal Stadium in Villarreal 06 April 2004. AFP PHOTO JOSE JORDAN
Villarreal's president Fernando Roig (L) and new coach Chilean Manuel Luis Pellegrini (R) arrive for Pellegrini's presentation, in Madrigal Stadium in Villarreal 06 April 2004. AFP PHOTO JOSE JORDAN
Pellegrini in the dugout during the Malaga - Barcelona game on May 21, 2011. Jorge Guerrero / AFP
Pellegrini in the dugout during the Malaga - Barcelona game on May 21, 2011. Jorge Guerrero / AFP
Pellegrini addresses the media at Dragao Stadium in Porto on February 18, 2013, on the eve of the Uefa Champions League. Fernando Veludo / AFP
Pellegrini addresses the media at Dragao Stadium in Porto on February 18, 2013, on the eve of the Uefa Champions League. Fernando Veludo / AFP
Pellegrini watches Villarreal take on Arsenal during their Uefa Champions League semi-final first leg match in London on April 19, 2006. Tom Hevezi / AP Photo
Pellegrini watches Villarreal take on Arsenal during their Uefa Champions League semi-final first leg match in London on April 19, 2006. Tom Hevezi / AP Photo
Pellegrini, left, looks on in the game against against Real Sociedad on April 22, 2006. Real Sociedad won the match 2-0. Fernando Bustamante / AP Photo
Pellegrini, left, looks on in the game against against Real Sociedad on April 22, 2006. Real Sociedad won the match 2-0. Fernando Bustamante / AP Photo
Pellegrini speaks to the media a day after he replaced Juande Ramos at Real Madrid on June 2, 2009. Pierre-Philippe Marcou / AFP
Pellegrini speaks to the media a day after he replaced Juande Ramos at Real Madrid on June 2, 2009. Pierre-Philippe Marcou / AFP
Pellegrini gives instructions to Kaka in a Primera Liga match against Getafe on October 31, 2009. Paul White / AP Photo
Pellegrini gives instructions to Kaka in a Primera Liga match against Getafe on October 31, 2009. Paul White / AP Photo
Pellegrini has handled big names such as Cristiano Ronaldo while at Real Madrid. Javier Soriano / AFP
Pellegrini has handled big names such as Cristiano Ronaldo while at Real Madrid. Javier Soriano / AFP
Manuel Pellegrini reacts as his Real Madrid side take on Osasuna at the Bernabeu on May 2, 2010. Dominque Faget / AFP
Manuel Pellegrini reacts as his Real Madrid side take on Osasuna at the Bernabeu on May 2, 2010. Dominque Faget / AFP
Pellegrini moved to Malaga, belonging to Qatari owners, and was officially presented on November 5, 2010. Jorge Guerrero / AFP
Pellegrini moved to Malaga, belonging to Qatari owners, and was officially presented on November 5, 2010. Jorge Guerrero / AFP

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In pictures: Manuel Pellegrini's Primera Liga stints in Spain

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Sangeeta Bandyopadhyay
Translated by Arunava Sinha
Tilted Axis Press 

What is graphene?

Graphene is extracted from graphite and is made up of pure carbon.

It is 200 times more resistant than steel and five times lighter than aluminum.

It conducts electricity better than any other material at room temperature.

It is thought that graphene could boost the useful life of batteries by 10 per cent.

Graphene can also detect cancer cells in the early stages of the disease.

The material was first discovered when Andre Geim and Konstantin Novoselov were 'playing' with graphite at the University of Manchester in 2004.

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