Wyoming The Wyoming, United States discovery of a tiny prehistoric bird, "Eocypselus rowei", may help explain the origins of hummingbirds.
Nature An international group of researchers announce in "Nature" the creation of a digital camera that can mimic the compound eyes of insects.
San Jose, California In San Jose, California, IBM researchers release "A Boy and His Atom", the smallest movie ever made, which was created by manipulating individual carbon monoxide molecules with a scanning tunneling microscope.
National Assembly Seven Venezuelan legislators are injured as a fight breaks out between the Socialist Party and the opposition over the outcome of the last month's presidential election.
Coronation Street British "Coronation Street" star William Roache, the world's longest-serving soap actor, is arrested and charged with two counts of raping a 15-year-old girl in 1967.
International Workers' Day A May Day protest in Seattle, United States, escalates into violence, causing injuries to eight police officers and damage to storefront property.
British Overseas Territories Several British Overseas Territories, including Bermuda and the Cayman Islands, sign agreements to share tax information with UK and other EU members.
UN human rights commissioner The UN Human Rights Office says that the force-feeding of hunger-strikers at the U.S. Guantánamo Bay Prison is a violation of international law.
Lào Cai Heavy rain and a whirlwind sweeps over eights districts and towns in Lào Cai Province, northern Vietnam, destroying 52 houses and 2 schools, ripping roofs off of 1600 houses, and damaging crops of local people.
Saudi Arabia Flash floods leave 16 people dead and 3 others missing in Saudi Arabia, with authorities urging citizens to avoid low-lying wadis. At least two others were killed in neighboring Oman in some of the heaviest rainfall in more than 25 years.
Makhachkala A bomb detonates in a busy shopping center in Makhachkala, Dagestan, Russia, killing 3 and injuring 2 others.
Boston Marathon bomber A report states that Dzhokhar has told detectives he was motivated by wanting to defend Islam because of the wars in Afghanistan and Iraq.
Pattani Insurgents kill six people, including a two-year-old boy, in a deadly shooting in Pattani, Thailand.