American philosopher David Lewis attends a meeting with Russian Prime Minister Dmitry Medvedev during the XXI Mendeleev Congress on general and applied chemistry, in St. Petersburg, Russia.

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Research adviser at Flerov Laboratory of Nuclear Reactions of the Joint Institute for Nuclear Research (JINR), physicist Yuri Oganessian attends a meeting with Russian Prime Minister Dmitry Medvedev during the XXI Mendeleev Congress on general and applied chemistry, in St. Petersburg, Russia.

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Minister of Science and Higher Education Mikhail Kotyukov attends a meeting with Russian Prime Minister Dmitry Medvedev during the XXI Mendeleev Congress on general and applied chemistry, in St. Petersburg, Russia.

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Vice President of the Royal Society of London for Improving Natural Knowledge, British chemist Professor Sir Martyn Poliakoff attends a meeting with Russian Prime Minister Dmitry Medvedev during the XXI Mendeleev Congress on general and applied chemistry, in St. Petersburg, Russia.

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Vice President of the Royal Society of London for Improving Natural Knowledge, British chemist Professor Sir Martyn Poliakoff attends a meeting with Russian Prime Minister Dmitry Medvedev during the XXI Mendeleev Congress on general and applied chemistry, in St. Petersburg, Russia.

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Vice President of the Royal Society of London for Improving Natural Knowledge, British chemist Professor Sir Martyn Poliakoff attends a meeting with Russian Prime Minister Dmitry Medvedev during the XXI Mendeleev Congress on general and applied chemistry, in St. Petersburg, Russia.

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Russian Prime Minister Dmitry Medvedev exits the United Russia's regional branch headquarters, in St. Petersburg, Russia.

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Russian Prime Minister Dmitry Medvedev arrives at the United Russia's regional branch headquarters, in St. Petersburg, Russia.

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Russian Prime Minister Dmitry Medvedev speaks during his visit to United Russia's regional branch headquarters, in St. Petersburg, Russia.

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Russian Prime Minister Dmitry Medvedev speaks during his visit to United Russia's regional branch headquarters, in St. Petersburg, Russia.

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Russian Prime Minister Dmitry Medvedev speaks during the XXI Mendeleev Congress on general and applied chemistry, in St. Petersburg, Russia.

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Russian Academy of Sciences President Alexander Sergeyev speaks during the XXI Mendeleev Congress on general and applied chemistry, in St. Petersburg, Russia. Deputy Prime Minister Tatyana Golikova is at right.

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Russian Academy of Sciences President Alexander Sergeyev speaks during the XXI Mendeleev Congress on general and applied chemistry, in St. Petersburg, Russia.

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Russian Prime Minister Dmitry Medvedev speaks during the XXI Mendeleev Congress on general and applied chemistry, in St. Petersburg, Russia.

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Russian Prime Minister Dmitry Medvedev speaks during the XXI Mendeleev Congress on general and applied chemistry, in St. Petersburg, Russia.

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Russian Prime Minister Dmitry Medvedev speaks during the XXI Mendeleev Congress on general and applied chemistry, in St. Petersburg, Russia.

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Russian Prime Minister Dmitry Medvedev speaks during the XXI Mendeleev Congress on general and applied chemistry, in St. Petersburg, Russia.

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Russian Prime Minister Dmitry Medvedev speaks during the XXI Mendeleev Congress on general and applied chemistry, in St. Petersburg, Russia.

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Russian Prime Minister Dmitry Medvedev speaks during the XXI Mendeleev Congress on general and applied chemistry, in St. Petersburg, Russia.

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Russian Prime Minister Dmitry Medvedev speaks during the XXI Mendeleev Congress on general and applied chemistry, in St. Petersburg, Russia.

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Russian Prime Minister Dmitry Medvedev shakes hands with Acting Governor of Saint Petersburg Alexander Beglov during his arrival at St. Petersburg, Russia. Presidential Plenipotentiary Envoy to the Northwestern Federal District Alexander Gutsan is second left, Governor of Leningrad Region Aleksandr Drozdenko is at right.

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