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O

Oort Offers a Theory of Comets

Oort Proves the Spiral Structure of the Milky Way

Opalia (Ancient Rome)

OPEC Is Founded

OPEC Sparks an Energy Crisis

Open access (OA)

Open carry in the United States

Open Casket by Sandra McPherson

Open Classrooms

Open Door Policy Toward China

Open House by Nadine Gordimer

Open innovation

Open market operation (OMO)

Open Organizations

Open Systems Interconnection model (OSI model)

Opening of Milan's La Scala

Opening of the Appalachian Trail

Opening of the Channel Tunnel

Opening of the Musée d'Orsay

Opening of the World Trade Center

Opening of the World's Largest Suspension Bridge

Openness to experience

Open-pit mining

Open-source software movement

Operant conditioning

Operant conditioning therapies

Operating system (OS)

Operation Ababil (2012)

Operation Babylift

Operation Backfire

Operation Barbarossa

Operation Bootstrap

Operation Chaos by Poul Anderson

Operation Desert Storm Begins

Operation Enduring Freedom Begins

Operation Iraqi Freedom Ends

Operation Just Cause Begins

Operation Magic Carpet Begins