Hagia Sophia: Istanbul's Ancient Mystery
Examine Hagia Sophia’s seismic secrets, which have insured its survival through a dozen earthquakes.
Petra: Lost City of Stone
Follow an archaeologist and sculptors to learn how the people of Petra built their city of stone.
Colosseum: Roman Death Trap
Watch a team re-create a lifting machine and trap-door system to release a wolf into the Colosseum.
Sinkholes: Buried Alive
Sinkholes are examined. The collapses can be gradual.
Sunken Ship Rescue
Follow the epic operation to secure, raise, and salvage the Costa Concordia cruise ship
Big Bang Machine
Watch as CERN scientists prepare to restart the history-making Large Hadron Collider.
2/27/15 2:00 PM
2/28/15 3:00 AM
3/1/15 1:00 AM
3/1/15 4:00 AM
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A high-flying weather observation plane skirts the earth-space boundary zone in a search for sprites, which are fleeting flashes that flicker upwards from thunderstorms for a split-second. Included: footage shot from the International Space Station.
Nova: Asteroid: Doomsday or Payday? at 9pm on WGBH 2. Examine whether asteroids could be our economic salvation — or instruments of extinction. Watch a preview.
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