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0:01:01
On November 15th, 1999, for the first time in 25 years, the planet Mercury passed between us (in the western hemisphere) and the sun--an event known as a "transit." Here is one of five short streaming videos detailing the event.

0:02:02
On November 15th, 1999, for the first time in 25 years, the planet Mercury passed between us (in the western hemisphere) and the sun--an event known as a "transit." Here is one of five short streaming videos detailing the event.

0:01:01
On November 15th, 1999, for the first time in 25 years, the planet Mercury passed between us (in the western hemisphere) and the sun--an event known as a "transit." Here is one of five short streaming videos detailing the event.

0:02:02
On November 15th, 1999, for the first time in 25 years, the planet Mercury passed between us (in the western hemisphere) and the sun--an event known as a "transit." Here is one of five short streaming videos detailing the event.

0:02:02
On November 15th, 1999, for the first time in 25 years, the planet Mercury passed between us (in the western hemisphere) and the sun--an event known as a "transit." Here is one of five short streaming videos detailing the event.

1:55:23
Exploratorium Senior Scientist Mary Miller presents audio dispatches from the "Review of the Causes and Consequences of Cold Events: A La Nina Summit" held in Boulder, Colorado. The workshop was presented by The United Nations University, The National Center for Atmospheric Research, and the United Nations Environment Program.

1:12:19
Exploratorium Senior Science Writer Mary Miller presents audio dispatches and selected lectures from the "Review of the Causes and Consequences of Cold Events: A La Nia Summit" held in Boulder, Colorado. The workshop was presented by The United Nations University, The National Center for Atmospheric Research, and the United Nations Environement Program.

1:16:36
Exploratorium Senior Science Writer Mary Miller presents audio dispatches and selected lectures from the "Review of the Causes and Consequences of Cold Events: A La Nina Summit" held in Boulder, Colorado. The workshop was presented by The United Nations University, The National Center for Atmospheric Research, and the United Nations Environment Program.

0:51:43
Exploratorium Senior Science Writer Mary Miller presents audio dispatches and selected lectures from the "Review of the Causes and Consequences of Cold Events: A La Nina Summit" held in Boulder, Colorado. The workshop was presented by The United Nations University, The National Center for Atmospheric Research, and the United Nations Environment Program.

0:45:08
Exploratorium Senior Science Writer Mary Miller presents audio dispatches and selected lectures from the "Review of the Causes and Consequences of Cold Events: A La Nina Summit" held in Boulder, Colorado. The workshop was presented by The United Nations University, The National Center for Atmospheric Research, and the United Nations Environment Program.