Browsing 270 - 280 results of 448 programs for subject - General Science
TI postdoctoral fellow Julie Yu explains what a stem cell is and why they’re important. TI teacher coach Rilla Chaney says she’s no singer, but she’s successfully used songs to teach science concepts in her classroom.
Celebrate Pi Day— an international holiday born at San Francisco’s Exploratorium. Join us for a live webcast where we examine the nature of everyone's favorite mathmatical constant, 3.1415926535…ad infinitum!
What makes one individual "fitter" than another? Staff scientist Karen Kalumuck introduces natural selection, then four teams of "predators" compete with each other for prey.Who will thrive and who will face extinction? Why do the hands on clocks go "clockwise?" Seems like a circular definition, but if you looked closely at sundials in the northern hemisphere, you'd notice that the shadow of the sun moves around the sundial in a "clockwise" direction. This was adopted by clock-makers and became the standard we know today.
In the southern hemisphere, the sun's shadow moves around the dial in the opposite direction, so if clocks had been invented there, our watches would move the other way. Our intrepid Exploratorium team shares experiences from their visit to Shackleton's hut. This hut is at Cape Royds, where Shackleton mounted an expedition to the South Pole and made a first ascent of Mt. Erebus.
We talk to photographer John Weller, who spent the austral summer 2008 scuba diving under the ice in Antarctica. The air is so dry here at McMurdo that anything that gets charged, stays charged. Moist air quickly discharges objects because the water in the air picks up charge from an object and quickly flies away, taking charges with it. This does not happen here. We are constantly getting shocks from our clothing, our bedding and when we exit vehicles. Geneticist Mark Stoneking discusses a special type of genetic material called mitochondrial DNA gets passed directly from mother to child. Largely unchanged from generation to generation, this genetic material gives researchers a way to track populations back in time. Anthropologist Tanya Smith explains that invisible microstructure inside teeth creates a durable record of life history, including events such as birth, illness, famine, stress, and death.