(Getty Images ) David Cameron (right) and Chinese Prime Minister Wen Jiabao (left) shake hands at a meeting in London in 2011.
How a Handshake Can Reinforce Positive Impressions
Delicious Reddit

OCTOBER 22, 2012

Important areas of the brain responded to seeing the handshakes, with Dr Sanda Dolcos saying the results showed the gesture had ‘a positive impact’.
In addition, the nucleus accumbens – a region of the brain that is sensitive to rewards – showed greater activity for meetings with handshakes than for those without, demonstrating ‘the positive effect of a handshake on social evaluation’.
Read more: Daily Mail