9 Strange Sounds No One Can Explain

iStock/BahadirTanriover
iStock/BahadirTanriover

Earth is its own frontier of intrigue and unexplainable phenomena. From mysterious bloops to baffling sonic booms and puzzling hums, our planet rings with unexplained sounds. Here are just a few that continue to confound scientists.

1. Upsweep

Upsweep is an unidentified sound that’s existed at least since the Pacific Marine Environmental Laboratory began recording SOSUS—an underwater sound surveillance system with listening stations around the world—in 1991. The sound “consists of a long train of narrow-band upsweeping sounds of several seconds duration each,” the laboratory reports. The source location is difficult to identify, but it's in the Pacific, around the halfway point between Australia and South America. Upsweep changes with the seasons, becoming loudest in spring and autumn, though it isn’t clear why. The leading theory is that it’s related to volcanic activity.

2. The Whistle

The Whistle was recorded on July 7, 1997, and only one hydrophone—the underwater microphones used by the National Oceanic and Atmospheric Administration (NOAA)—picked it up. The location is unknown and limited information has made it difficult to speculate on the source.

3. Bloop

Bloop is the big kahuna in unexplained sounds. In 1997 (a big year for auditory ocean mysteries), an extremely powerful, ultra-low-frequency sound was detected at various listening stations thousands of miles apart and traced to somewhere west of the southern tip of South America. The sound only lasted about a minute and and was heard repeatedly over the summer, but not since. Bloop is generally believed to be the sound of a massive icequake, but scientists haven’t totally ruled out the possibility that the sound originated from something “organic.”

That’s where things get eerie. If an animal was the source of Bloop, it would have to be larger than a blue whale. The most fanciful of all theories stems from the fact that Bloop’s location is somewhat close to author H.P. Lovecraft’s fictional sunken city of R’lyeh, where the creature known as Cthulhu lies “dead but dreaming.” Cthulhu can best be described as part man, dragon, and octopus, which seems as likely a source as any for the ocean’s greatest aural anomaly.

4. Julia

Julia was recorded on March 1, 1999, lasted for roughly 15 seconds, and was loud enough to be heard by the entire Equatorial Pacific Ocean hydrophone array. An Antarctic iceberg run aground is the leading suspect for its source.

5. Slow Down

Slow Down was first recorded on May 19, 1997 and is also credited to an iceberg running aground, though some people insist it might be a giant squid. The sound, lasting about seven minutes, gradually decreases in frequency, hence the name “slow down.” Like Upsweep, the sound has been heard periodically since it was initially detected.

6. The Hum

The Hum has been recorded on several occasions, mostly during the last 50 years or so. In these cases, there have been reports of a relentless and troubling low-frequency humming noise that can only heard by a certain portion of the population. It’s difficult to pinpoint when instances of the Hum began, but it’s been well-documented since the 1970s, and since then, cases have popped up all over the world—from Ontario, Canada to Taos, New Mexico to Bristol, England to Largs, Scotland and Auckland, New Zealand.

In most instances, the affected group only makes up around 2 percent of the population, but for those individuals, the Hum is largely inescapable and impossible to track. Those affected report never having heard noises before, and say the Hum is generally heard indoors and becomes louder at night. It’s also most common in rural and suburban areas and among people between age 55 and 70.

Scientists have long investigated the cause of the drone, occasionally tracing it to industrial equipment emitting particular frequencies. For the most part, though, the sound has left the world completely puzzled. The list of other possible culprits is long and wide-ranging—wireless communication devices, power or gas lines, electromagnetic radiation, radio waves, or Earth tremors are all suspects. Because the Hum appears and disappears and because the cause may vary from case to case, the phenomenon still baffles researchers. At this point, a few things are clear: The Hum is real and likely a byproduct of 21st-century living.

7. Skyquakes

Skyquakes, or unexplained sonic booms, have been heard around the world for the last 200 years or so, usually near bodies of water. These headscratchers have been reported on the Ganges in India, the East Coast and inland Finger Lakes of the U.S., near the North Sea, and in Australia, Japan, and Italy. The sound—which has been described as mimicking massive thunder or cannon fire—has been chalked up to everything from meteors entering the atmosphere to gas escaping from vents in the Earth's surface (or the gas exploding after being trapped underwater as a result of biological decay) to earthquakes, military aircraft, underwater caves collapsing, and even a possible byproduct of solar and/or Earth-based magnetic activity.

8. UVB-76

UVB-76, also known as The Buzzer, has been showing up on shortwave radios for decades. It broadcasts at 4625 kHz and after repeated buzzing noises, a voice occasionally reads numbers and names in Russian. The source and purpose has never been determined.

9. 52-Hertz whale

This animal, also known as the loneliest whale in the world, calls at a highly unusual 52 hertz, well above the normal frequency. Scientists have been listening to 52-Hertz for decades, and recently, filmmakers raised $400,000 on Kickstarter to seek the mammal out. It should be noted that the fundraiser reached its goal through the help of Leonardo DiCaprio, another mysterious beast.

Amazon's Under-the-Radar Coupon Page Features Deals on Home Goods, Electronics, and Groceries

Stock Catalog, Flickr // CC BY 2.0
Stock Catalog, Flickr // CC BY 2.0

This article contains affiliate links to products selected by our editors. Mental Floss may receive a commission for purchases made through these links.

Now that Prime Day is over, and with Black Friday and Cyber Monday still a few weeks away, online deals may seem harder to come by. And while it can be a hassle to scour the internet for promo codes, buy-one-get-one deals, and flash sales, Amazon actually has an extensive coupon page you might not know about that features deals to look through every day.

As pointed out by People, the coupon page breaks deals down by categories, like electronics, home & kitchen, and groceries (the coupons even work with SNAP benefits). Since most of the deals revolve around the essentials, it's easy to stock up on items like Cottonelle toilet paper, Tide Pods, Cascade dishwasher detergent, and a 50 pack of surgical masks whenever you're running low.

But the low prices don't just stop at necessities. If you’re looking for the best deal on headphones, all you have to do is go to the electronics coupon page and it will bring up a deal on these COWIN E7 PRO noise-canceling headphones, which are now $80, thanks to a $10 coupon you could have missed.

Alternatively, if you are looking for deals on specific brands, you can search for their coupons from the page. So if you've had your eye on the Homall S-Racer gaming chair, you’ll find there's currently a coupon that saves you 5 percent, thanks to a simple search.

To discover all the deals you have been missing out on, head over to the Amazon Coupons page.

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When a Long Island Housewife Handed Out Arsenic to Kids on Halloween

This Halloween procession in Massachusetts was poison-free.
This Halloween procession in Massachusetts was poison-free.
Douglas DeNatale, Lowell Folklife Project Collection, American Folklife Center at the Library of Congress // No Known Restrictions on Publication

On October 31, 1964, 13-year-old Elsie Drucker and her 15-year-old sister Irene returned to their Long Island home after an evening of trick-or-treating and dumped their spoils onto the table. Among the assortment of bite-sized sweets were two items that looked like bottle caps and bore the warning: “Poison. Keep away from children and animals.”

It wasn’t an ill-conceived, Halloween-themed marketing ploy—the tablets were “ant buttons,” which contained arsenic and could help rid a house of insects and other pests. They could also seriously threaten the life of any small child who accidentally swallowed one.

Alarmed, the girls’ father called the police.

A Criminally Bad Joke

The authorities notified the community, and people immediately began spreading the word and inspecting their own candy bags, unearthing another 19 ant buttons around town. Meanwhile, Elsie and Irene helped the police trace the toxic treats to 43 Salem Ridge Drive, where a 47-year-old housewife named Helen Pfeil lived with her husband and children.

Once other trick-or-treaters confirmed that Pfeil had indeed doled out the poison—and police discovered empty boxes of ant buttons in her kitchen—she was arrested. Fortunately, none of her would-be victims ingested any hazardous material, which meant that Pfeil was only charged with child endangerment. If convicted, however, she could still face prison time.

At her arraignment on November 2, Pfeil tried to explain to a baffled courtroom that she “didn’t mean it maliciously.” After having spent most of Halloween bestowing actual candy on costumed kids, Pfeil had started to feel like some of them should’ve already aged out of the activity.

“Aren’t you a little old to be trick-or-treating?” she had asked the Druckers, according to the New York Post.

So Pfeil had assembled unsavory packages of ant buttons, dog biscuits, and steel wool, and dropped those into the bags of anyone she deemed “a little old” to be trick-or-treating. She maintained that it was a joke, and her husband, Elmer, reiterated her claim to reporters at the courthouse. While she had been “terribly thoughtless and she may have used awfully bad judgment,” he said, she hadn’t planned to cause harm. Elmer himself wasn’t in on the scheme; at the time, he had been out trick-or-treating with their two sons—who, ironically, were both teenagers.

Her spouse may have been sympathetic, but Judge Victor Orgera was not. “It is hard for me to understand how any woman with sense or reason could give this to a child,” he said, and ordered her to spend 60 days in a psychiatric hospital.

Dumb, Not Dangerous

The following April, Pfeil went on trial in Riverhead, New York, and switched her plea from “Not guilty” to “Guilty” when proceedings were already underway. With about two months until her sentencing date—and the possibility of up to two years in prison looming overhead—Pfeil’s neighbors got busy writing character references to send to the judge.

Though Judge Thomas M. Stark was just as bewildered by Pfeil’s indiscretion as everyone else, the letters convinced him that she was not a danger to society, and he suspended her sentence. “I don’t understand why she had done such a stupid thing as this,” Stark said, “but I feel incarceration is not the answer.”

So Pfeil got off with nothing more than a guilty conscience, and Long Island teenagers continued to pound the pavement for Halloweens to come. But the misguided ruse did scare at least one child into giving it up forever: Little Elsie Drucker never went trick-or-treating again.