Episode 1
Aired Jan 14, 2015
Big Bang Machine
CERN scientists prepare to restart the Large Hadron Collider to examine the world's tiniest particles.
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Episode 2
Aired Jan 21, 2015
Sunken Ship Rescue
Efforts to secure, raise and salvage the Costa Concordia cruise ship which capsized off the Italian coast on Jan. 13, 2012, killing 32 people.
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Episode 3
Aired Jan 28, 2015
Sinkholes -- Buried Alive
Scientists explore the underlying forces behind sinkholes.
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Episode 4
Aired Feb 11, 2015
Colosseum -- Roman Death Trap
Archaeologists and engineers build a 25-foot lifting machine and trap-door system to release a wolf into the Colosseum's arena.
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Episode 5
Aired Feb 18, 2015
Petra -- Lost City of Stone
How the ancient people of Petra built their city of stone.
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Episode 6
Aired Feb 25, 2015
Hagia Sophia -- Istanbul's Ancient Mystery
Istanbul's Hagia Sophia survives numerous earthquakes.
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Episode 7
Aired Apr 15, 2015
The Great Math Mystery
Exploring math's power across the centuries, from the first wireless radio transmissions to the landing of rovers on Mars.
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Episode 8
Aired Apr 22, 2015
Invisible Universe Revealed
The Hubble Space Telescope's discoveries over the past 25 years.
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Episode 9
Aired May 6, 2015
Nazi Attack on America
Ocean explorer Robert Ballard investigates the wreck of a German submarine at the bottom of the Gulf of Mexico, just a few miles off New Orleans.
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Episode 10
Aired May 13, 2015
Lethal Seas
Researchers seek solutions to contain the rising acidity levels that are threatening the world's oceans.
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Episode 11
Aired Jul 15, 2015
Chasing Pluto
NASA's New Horizons probe captures the first-ever detailed images of the icy world of Pluto.
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Episode 12
Aired Jul 29, 2015
Nuclear Meltdown Disaster
The minute-by-minute story of the Fukushima Daiichi nuclear disaster, which resulted from the earthquake and tsunami, and its aftermath.
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Episode 13
Aired Sep 16, 2015
Dawn of Humanity
The discovery of ancient fossil human ancestors in South Africa.
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Episode 14
Aired Sep 23, 2015
Arctic Ghost Ship
Clues found on the ocean floor may clarify what happened to British explorer John Franklin and the 128 men who set off in two Royal Navy ships to chart the Northwest Passage in 1845, never to be heard from again.
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Episode 15
Aired Oct 7, 2015
Secrets of Noah's Ark
A new version of the biblical flood story includes instructions for assembling an ark.
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Episode 16
Aired Oct 14, 2015
Cyberwar Threat
Cyber weapons have the ability to inflict physical damage on factories, power plants and pipelines.
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Episode 17
Aired Oct 28, 2015
Animal Mummies
Hi-tech images reveal the role of animal mummies in ancient Egyptian beliefs.
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Episode 18
Aired Nov 4, 2015
Making North America: Origins
The shaping of North America, including palm trees that once thrived in Alaska and an eruption that nearly tore the Midwest in two.
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Episode 19
Aired Nov 11, 2015
Making North America: Life
The intertwined story of life and the landscape in North America -- from origins to dinosaurs and an ancient primate invasion.
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Episode 20
Aired Nov 18, 2015
Making North America: Human
From Ice Age to the oil boom, humans face challenges and uncover wealth hidden in North America's landscape.
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Episode 21
Aired Nov 25, 2015
Inside Einstein's Mind
Retracing Einstein's thought experiments reveals the simple ideas that reshaped the world's understanding of gravity.
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