Fair

German Chancellor Angela Merkel receives a flower from a humanoid robot decorated with typical Dutch attributes - a traditional dress and a tulip - during the official opening of the Hannover Messe industrial trade fair in Hanover, central Germany on April 7, 2014. The Netherlands is the partner country of this year's trade fair running from April 7 to 11, 2014 and presenting a cross section of key industrial technologies.

Johannes Eisele/AFP

German Chancellor Angela Merkel receives a flower from a robot decorated with typical Dutch attributes − a traditional dress and a tulip − during the official opening of the Hannover Messe industrial trade fair in central Germany on Monday.

Cacti on display in the Royal Horticultural Society's 'Great London Plant Fair' in the RHS Lawrence and Lindley Halls on April 1, 2014 in London, England. The show, which aims to celebrate the vibrancy of spring, includes the 'RHS Early Daffodil Competition' and runs until April 4, 2014.

Oli Scarff/Getty Images

Cacti on display in the Royal Horticultural Society’s Great London Plant Fair in the RHS Lawrence and Lindley Halls on Tuesday in London, England. The show, which aims to celebrate the vibrancy of spring, includes the RHS Early Daffodil Competition and runs until Friday.

Guidelines for where to place books are pictured at an empty rack at a booth during preparations for the upcoming book fair in Frankfurt...Guidelines for where to place books are pictured at an empty rack at a booth during preparations for the upcoming book fair in Frankfurt, October 7, 2013. The world's largest book fair runs from October 9 to October 13 and features the literature of Brazil as its guest of honour. REUTERS/Ralph Orlowski

Ralph Orlowski/Reuters

Guidelines on a rack showing where to place books during preparations for the forthcoming book fair in Frankfurt. The largest event of its kind runs from October 9 to October 13 and features the literature of Brazil as its guest of honour. Read more

A girl laughs as she sits among hand fans during a mass performance at a children's martial arts fair in Foshan...A girl laughs as she sits among hand fans during a mass performance at a children's martial arts fair in Foshan, Guangdong province May 31, 2013. REUTERS/Stringer (CHINA - Tags: EDUCATION SOCIETY TPX IMAGES OF THE DAY) CHINA OUT. NO COMMERCIAL OR EDITORIAL SALES IN CHINA

Reuters

A girl laughs as she sits among hand fans during a mass performance at a children’s martial arts fair in Foshan, Guangdong province in China on Friday. Read more