A masked youth throws a petrol bomb at police during riots after a peaceful march on the first day of a 48-hour strike by workers' unions in Athens on October 19. Yannis Behrakis/Reuters

A demonstrator is hit by a jet of water released from a riot police vehicle as they clash during a national strike in Santiago, Chile on October 19. Students, workers and citizens staged a 48-hour national strike demanding reforms in the public state education system. Carlos Vera/Reuters

Members of US team perform during the synchronised swimming preliminaries at the Pan American Games in Guadalajara, Mexico on October 19. Jorge Silva/Reuters

An anti-Gaddafi fighter flashes victory signs on an armored bulldozer during violent clashes with pro-Gaddafi forces at the frontline in Sirte Thaier al-Sudani/Reuters

Actress Lindsay Lohan (Right), with her attorney Shawn Holley, sits during a progress report hearing at Airport Branch Courthouse in Los Angeles on October 19. The judge revoked her probation for failing to appear at a series of community service appointments at the Downtown Women's Shelter. Mark Boster/Pool/Reuters

Ana Julia Torres kisses a dromedary that has problems with its vision at the Villa Lorena animal refuge in the city of Cali in Colombia on October 19. Torres is a teacher who for the last 18 years has been adopting and helping injured animals. She founded the Villa Lorena shelter for injured and mistreated animals, which cares for at least 700 animals, including some that have been injured by hunters.Jaime Saldarriaga/Reuters

US President Barack Obama and first lady Michelle Obama pick Halloween pumpkins at Wood's Orchard in Hampton, Virginia, on October 19. Obama continued his three day bus trip to North Carolina and Virginia on Wednesday to promote his American Jobs Act that faces congressional approval. Jason Reed/Reuters

Victoria's Secret 2011 Fantasy Treasure Bra is seen in New York on October 19. The bra, designed by London Jewelers, contains 142 carats of diamonds in addition to pearls, citrines and aquamarines and is valued at $2.5 million. Shannon Stapleton/Reuters

Faculty of medicine first year students run while seniors spray them with different types of sauces, liquids and flour as part of an annual tradition during a celebration in honour of their patron Saint Lucas at Granada University in Granada, southern Spain on October 19. Pepe Marin/Reuters

A customer scans a bag of apples with Scan It! Mobile app on his iPhone while shopping at Stop and Shop supermarket in Braintree, Massachusetts. Retailers are in the midst of the technology revolution. Research firm VDC Research estimates retailers worldwide will spend 12 per cent more on installing self-check-out kiosks -- which require fewer staff -- by 2015. Stop & Shop is piloting the program that allows shoppers to use their smart phones to scan groceries as they pull them off the shelves -- a move that could lead to even fewer check-out clerks. Adam Hunger/Reuters