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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.

0:53:59
Watch as Exploratorium staff and local teachers compete for the title of Iron Science Teacher. Each contestant has ten minutes to make a science lesson out of a secret ingredient. Today's secret ingredient: pumpkins!

2:00:05
On August 11, 1999, 3:00 a.m. Pacific Standard Time, the Exploratorium presented a live Webcast of a total solar eclipse that passed across Europe and Asia. The program included direct satellite communication with our expedition team, reporting from a crowded square in Amasya, Turkey, a town along the path of totality.

1:07:01
Watch as the best teachers on the planet battle it out for the title of Iron Science Teacher. In this zany competition teachers will have ten minutes to create a science activity. This week’s “secret” ingredient: cups!

1:13:45
Watch as the best teachers on the planet battle it out for the title of Iron Science Teacher. In this zany competition teachers will have ten minutes to create a science activity. This week’s “secret” ingredient: ping pong balls!

1:00:07
Watch as the best teachers on the planet battle it out for the title of Iron Science Teacher. In this zany competition teachers will have ten minutes to create a science activity. This week’s “secret” ingredient: food coloring!

0:54:03
Watch as the best teachers on the planet battle it out for the title of Iron Science Teacher. In this zany competition teachers will have ten minutes to create a science activity. This week’s “secret” ingredient: compact ∂iscs!

1:03:28
Host Greg Caroll and riders from Stereo, Think, and Real Skateboards perform as Exploratorium staff physicist Paul Doherty explains the physics behind this extreme sport.

2:19:31
Visit a chocolate factory and learn how to make chocolate candles! Host Sedge Thomson talks with chocolatiers, chefs, and scientists about the history and science of this intoxicating food.

1:42:45
Can a question influence its answer? Discover the power of verbal overshadowing--ways in which words enhance or distract from different sensory memories. Dr. Schooler, Associate Professor of Cognitive Psychology at the University of Pittsburgh and research scientist at the Learning Research and Development Center, will arrange a variety of sense-memory experiments, including wine-tasting and jellybean-tasting!