The Hardest Unsolved Math Problem In The World
The Millennium Problems were seven of the hardest unsolved math problems in the world, paired with a prize. Solve one and win a million bucks.
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Unsolved Disappearances That Will Haunt You
Disappearances are freaky. When cops can't solve the cases, though, the disappearances get even scarier. These unsolved disappearances will haunt you.
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The Oldest Cold Case: Who Killed Otzi The Iceman?
It wasn't until 2001 that scientists saw in an X-ray image that Ötzi has an arrowhead sunk deep into his left shoulder, which severed his subclavian artery.
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The Unsolved Disappearance Of Ray Gricar
Gricar's disappearance remains a mystery to this day.
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The Mysterious Disappearance Of Lynette Dawson
On January 9, 1982, 33-year-old Lynette Joy Dawson seemingly vanished. Purportedly, her husband, Chris, did not report she was missing until a month later.
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Adrienne Salinas: The Unsolved 2013 Death Of An Arizona College Student
Adrienne Salinas went missing in the early morning hours of June 2013 and her remains were found months later. The college student's death is still unsolved.
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The Mysterious Disappearance And Tragic Death Of Vanessa Guillén
U.S. Army Specialist Vanessa Guillén mysteriously went missing in April 2020, and after a year-long investigation, authorities seem to know what happened.
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The Unsolved 2017 Death Of Nanette Krentel
In 2017, Nanette Krentel was killed in her Lacomb, Louisiana home - she was shot in the head, and the property was burned down. Here's the story.
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Details About Madeleine McCann's Parents (And Life Since Madeleine's Disappearance)
Madeleine McCann, a few days shy of her fourth birthday, vanished from her bedroom while her family visited Praia de Luz, Portugal, in May 2007.
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The Mysterious Disappearance Of Egyptian Ruler Al-Hakim
Al-Hakim bi-Amr Allah, the sixth Fatimid caliph in Egypt. Known for his harsh laws, at only 36 years old, he mysteriously disappeared and was never found.
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The Messed Up Disappearance Of Adrien McNaughton
On June 12, 1972, 5-year-old Adrien McNaughton, his father, a family friend, and his three siblings were fishing at Holmes Lake near Calabogie, Ontario, Canada.
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The Mysterious Disappearance Of Angela Hammond
About 30 years ago, a four-month-pregnant Angela Hammond went missing, and her mysterious disappearance is still unsolved.
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The Mysterious Disappearance Of Christina Whittaker
The disappearance of Christine Whittaker in 2009 shook smalltown USA Hannibal, Missouri. A potential victim of human trafficking, there have been few leads.
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The Crucial Piece Of Evidence In The Morgan Nick Case Found Years After The Suspect Was Already Dead
In 1995, six-year-old Arkansas resident Morgan Nick disappeared. Now new evidence found in the case may finally reveal Morgan's abductor, who has since died.
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Malaysia Flight 370: Chilling Details About The Mysterious Disappearance
Malaysia Airlines Flight 370 was carrying 239 people when it disappeared in 2014. Here are the chilling details known about its mysterious disappearance.
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The Unsolved Mystery Of 'Handbags' In Ancient Stone Carvings
Elements of ancient architecture and art do stand out and beg for explanation. Such is the case with the "handbags" seen on stone reliefs across the globe.
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The Drought That Solved A 40-Year-Old Cold Case
It's bad enough when someone unexpectedly goes missing. It's made doubly tragic when those involved are just teenagers. Worse? When there's no closure.
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The Mysterious Disappearance Of Helen Brach The Candy Lady
Helen Brach went missing in 1977, and the case has never been closed. Here are the fascinating details of the mysterious disappearance of the Candy Lady.
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The Biggest Maura Murray Theories: What Really Happened?
Although it has been 17 years since Maura Murray vanished, authorities have never found a trace of the missing woman, and her disappearance remains unsolved.
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Tragic Details Found In Elisa Lam's Autopsy Report
Canadian tourist Elisa Lam went missing while she was staying at the infamous Cecil Hotel in downtown Los Angeles. Here's what was found in her autopsy report.
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The Biggest Lauren Spierer Theories: What Really Happened?
Lauren Spierer, a student at Indiana University, vanished without a trace in the early morning hours of June 3, 2011. To date, her case has not been solved.
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The Killer Of 4-Year-Old Grégory Villemin Remains A Mystery Decades Later
The abduction and murder of 4-year-old Grégory Villemin shook his French community. Here is why his killer remains a mystery even several decades later.
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The Mysterious Disappearance Of John Favara
John Favara, who accidentally killed 12-year-old Frankie Gotti, disappeared in 1980.
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The Mysterious 1934 Disappearance Of Nation Of Islam Founder, Wallace D. Fard
The disappearance of Nation of Islam founder Wallace D. Fard has been a mystery for decades. Here's what happened to the founder of the controversial group.
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How Many Cold Cases Have Been Solved Because Of Genetic Genealogy Testing?
Advances in DNA technology have led to things like commercial ancestry DNA testing and the use of DNA in forensics — solving crime by matching the DNA samples.
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The Frightening Conspiracy Theory That Links Missing Persons Cases To U.S. Cave Systems
In the United States, approximately 600,000 people go missing each here. Here is more about the terrifying conspiracy theory that links disappearances to caves.
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Why Do Cold Cases Often Never Get Solved?
Across the United States, an unprecedented number of homicide cases remain cold. Here is a closer look into why so many cold cases are often never solved.
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