2007 was designated as the International Heliophysical Year and the International Polar Year. Events January January 1 – Bulgaria and Romania join the European Union, while Slovenia joins the Eurozone. January 8 – Russian oil supplies to Poland, Germany, and Ukraine are cut as the Russia–Belarus energy dispute escalates; they are restored three days later. January 9 – Apple CEO Steve Jobs introduces the original iPhone at a Macworld keynote in San Francisco, beginning a new era of smartphones with this invention. January 31 - Boston faces a hoax bomb scare, as a result of LED placards of Ignignokt and Err from Aqua Teen Hunger Force being mistaken as an improvised explosive device February February 2 – The IPCC publishes its fourth assessment report, having concluded that global climate change is "very likely" to have a predominantly human cause. February 3 – A truck bomb explodes in Baghdad, Iraq, killing at least 135 people and injures 339 others. February 13 – North Korea agrees to shut down its nuclear facilities in Yongbyon by April 14 as a first step towards complete denuclearization, receiving in return energy aid equivalent to 50,000 tons of heavy fuel oil. February 19 – Microblogging social network Tumblr is launched to the public. February 26 – The International Court of Justice finds Serbia guilty of failing to prevent genocide in the Srebrenica massacre, but clears it of direct responsibility and complicity in the case. March March 1 – The fourth International Polar Year, a $1.73 billion research program to study both the North Pole and South Pole, is launched in Paris. March 3 – A total lunar eclipse occurs and is visible in the Americas, Europe, Africa and Asia. It is the 52nd lunar eclipse of Lunar Saros series 123 occurring at the moon's descending node. The moon is just 3.2 days before apogee, making it fairly small. March 11 – According to an accusation by Georgia, three Russian helicopters fire on the Georgian-controlled Kodori Gorge in a break-away autonomous republic of Abkhazia in north-western Georgia. March 13 – April 28 – The 2007 Cricket World Cup is held in the West Indies and is won by Australia. March 19 – The first solar eclipse of the year 2007 is a partial solar eclipse occurring just 0.7 days before perigee, making it very large. The Moon covers 87.558% of the Sun. In this partial solar eclipse,