15 May 2014, 09:18 PM ET
Our modern Western calendar is almost entirely a Roman invention, but it has changed significantly throughout history.
15 May 2014, 05:00 PM ET
World War I is frequently referred to as "the first modern war." Nowhere was this more true than in the realm of communications — the recent introduction of electric- and radio-based communications revolutionized the art of war.
15 May 2014, 02:00 PM ET
A near-complete human skeleton in a watery cave in Mexico is helping scientists answer the question, "Who were the first Americans?"
15 May 2014, 02:00 PM ET
The ancient skeleton of a teenage girl found in an underwater cave in Mexico may be the missing link that solves the long-standing mystery behind the identity of the first Americans, researchers say.
15 May 2014, 12:11 AM ET
It’s often said that there was no tradition of scientific medicine in medieval times.
14 May 2014, 01:45 PM ET
Murals depicting Crusader knights have been rediscovered in a Jerusalem hospital, a century after they were painted over. The murals were painted by a French count who wanted to boost Christianity in the city.
14 May 2014, 01:27 PM ET
Murals painted in a Jerusalem hospital more than a century ago are rediscovered after a broken water pipe strips away modern paint. The murals were painted over during World War I and were never fully restored.
13 May 2014, 04:01 PM ET
In the centuries before World War I, wars were waged on land, or by navies on the high seas. But by the time "the war to end all wars" started in 1914, airplanes had captured the public's attention, and military leaders took notice, too.
13 May 2014, 02:31 PM ET
A mummy previously suspected to be a fake, in fact contains the remains of a human fetus, CT scanning reveals.
13 May 2014, 09:13 AM ET
The wreckage of Christopher Columbus' long-lost ship, the Santa Maria, may have been found off the coast of Haiti. If verified, the discovery could solve a more than 500-year-old mystery of the famous vessel's final resting place.
13 May 2014, 01:55 AM ET
Mind-bending engravings from the 1500s continue to inspire science and matehmatics research.
12 May 2014, 12:49 AM ET
Zeno spent his life exasperating others. He conjured up a series of apparently contradictory situations known as Zeno’s Paradoxes, which have inspired centuries of debate among philosophers and mathematicians.
10 May 2014, 07:48 AM ET
A look at a long history of public records highlights just how much motherhood has changed in the United States. In 1860, only 7.5 percent of moms were employed outside the home, compared with nearly 70 percent today.
09 May 2014, 07:54 PM ET
The use of "anno domini" and "before Christ" to mark time began in the early days of Christianity, when clerics needed to know when Easter would fall.
09 May 2014, 07:27 PM ET
The first atomic bombs were detonated during World War II.
08 May 2014, 12:22 PM ET
Comparing carbon atoms among mummies reveals vegetarian diets.
07 May 2014, 07:23 PM ET
The Romans named the days of the week after their gods. The Germanic people adapted the Roman system and gave us the English names of the days.
07 May 2014, 05:00 PM ET
Generations of Europeans who lived after the Black Death were healthier and lived longer than those who lived before the plague's first outbreak, new research shows. The plague may have wiped out the weak and frail, leaving a stronger population behind.
06 May 2014, 02:24 PM ET
World War I, which lasted from July 1914 to November 1918, introduced many scientific and technological advances, leading some observers to refer to it as "the first modern war."
05 May 2014, 05:35 PM ET
More than 60 pounds (27 kilograms) of gold were recovered from a famous shipwreck off the coast of South Carolina. An ocean exploration company is planning to retrieve the rest of the shipwreck's treasure.
05 May 2014, 05:02 PM ET
In 1857, a steamship loaded with 30,000 pounds of gold sunk off the coast of South Carolina. An ocean exploration company is planning to recover the sunken treasure.
05 May 2014, 03:00 PM ET
Older than the famous Nazca lines, geoglyphs in Peru's Chinca Valley mark the way to large mounds that were likely the site of fairs and festivals. The sites would have attracted people from the coast as well as the Andean highlands.
05 May 2014, 03:00 PM ET
Rock lines that predate the famous Nazca Lines by hundreds of years probably marked the way to fair sites that brought together people from coastal Peru and the high Andes, new research suggests. Many of the lines mark the winter solstice.
02 May 2014, 06:38 PM ET
The "Gospel of Jesus's Wife," a papyrus written in Coptic and containing text that refers to Jesus being married, is looking more and more like it is not authentic, research is revealing.
02 May 2014, 05:42 PM ET
A new documentary about the "Gospel of Jesus's Wife" delves deep into the story behind this tiny scrap of papyrus. Viewers may come away more confident in the fragment's authenticity than some researchers would prefer, however.
02 May 2014, 03:45 PM ET
King Tutankhamun's tomb in Egypt went undisturbed for 3,000 years. But the ancient crypt has been ravaged by tourism. To prevent further damage and deterioration, Egyptian officials have unveiled a life-size replica of the tomb for visitors to explore.
02 May 2014, 03:15 PM ET
Pot reform has been on the lips of politicians here lately. But the current conversations about cannabis are hardly new. Prominent New York politicians have been challenging pot prohibition for nearly 70 years.
02 May 2014, 12:30 PM ET
An extremely rare 158-year-old postage stamp — one that has been described as the Holy Grail for stamp collectors — will be auctioned off this summer in New York City. The famous postal artifact could fetch as much as $20 million, according to Sotheby's.
02 May 2014, 11:58 AM ET
Leonardo Da Vinci's Mona Lisa painting may be part of the oldest 3D artwork, say two visual scientists, who looked at the original version and one painted possibly alongside it, called the Prado version.
01 May 2014, 10:44 PM ET
The Egyptians started dividing the day into 24 units, a practice that continues to influence how we tell time.
01 May 2014, 02:30 PM ET
The ancient Egyptians who built the pyramids may have been able to move massive stone blocks across the desert by wetting the sand in front of a contraption built to pull the heavy objects, according to a new study.
01 May 2014, 10:45 AM ET
The story of a circus train accident has become the stuff of legend in the Pennsylvania town of Tyrone, but some researchers are hunting for more tangible traces of that pileup in the form of a mass grave.