Ali Saleh, 58, a displaced Syrian originally from Palmyra, in Homs governorate, builds a model of an archaeological landmark of his home city, from his workshop in the rebel-held city al-Bab, northwest of Aleppo, in northern Syria. AFP

Displaced Syrian builds model of Palmyra from memory - in pictures



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WHAT IS GRAPHENE?

It was discovered in 2004, when Russian-born Manchester scientists Andrei Geim and Kostya Novoselov were experimenting with sticky tape and graphite, the material used as lead in pencils.

Placing the tape on the graphite and peeling it, they managed to rip off thin flakes of carbon. In the beginning they got flakes consisting of many layers of graphene. But when they repeated the process many times, the flakes got thinner.

By separating the graphite fragments repeatedly, they managed to create flakes that were just one atom thick. Their experiment led to graphene being isolated for the very first time.

In 2010, Geim and Novoselov were awarded the Nobel Prize for Physics. 

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