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Balloons: How high can they fly?
Helium balloons rise higher than hot air balloons. The current altitude record for a helium balloon was set by Malcolm Ross, who flew to over 113,000 feet.
November 28, 2009
What causes the colors in flames?
When you gaze at a wood fire, you might notice different colors in flames. What causes them? It's like the colors of stars indicate their temperatures.
November 28, 2009
Is twilight shorter at the equator?
The sun drops quickly down toward the horizon - and just as quickly sinks below the horizon - as seen from Earth's equatorial latitudes.
November 28, 2009
Nancy Moreno on butterflies launched into space
Nancy Moreno explained that the butterflies in space experiment will help scientists - and students - understand how gravity influences growth.
November 23, 2009
‘Mowing the lawn’ at high altitude
The ICE Bridge mission - dubbed "mowing the lawn" has been so successful that eight flights will be added keeping us in Chile until Thanksgiving.
November 17, 2009
Peter Gleick warns that world faces a water crisis
Forty percent of the world's population doesn't have access to adequate sanitation services, says water expert Peter Gleick.
November 16, 2009
Jeff Mount on what it really means to restore a river
Jeff Mount said today, river restoration is about creating healthy ecosystems that can sustain human demands and provide benefits to neighboring ecosystems
November 16, 2009
Shackleton to satellites: Field-work and exploration
The Shackleton ill fated expedition in Antarctica comes to mind when we consider the perils of field-work in early Antarctic exploration.
November 9, 2009
Dev Niyogi on urban sprawl and storm intensity
Climatologist Dev Niyogi talks about why a tornado struck downtown Atlanta in 2008, and how to reduce the threat of urban tornadoes.
November 9, 2009
Beth Shapiro uses DNA to see how animals fared in ancient climate
Beth Shapiro believes her work provides a valuable perspective into the interactions between the animals and environment of the past.
November 9, 2009
