Native Americans used controlled fires to manage the land. These prescribed burns decreased the impact/frequency of damaging wildfires, boosted agricultural production, helped with hunting, and reduced tick populations. en.wikipedia.org/wiki/Nat…
Yuma, AZ is the driest, the sunniest, and the least humid, has the lowest frequency of precipitation, and has the highest number of days per yearβ€”175β€”with a daily maximum temperature of 90 Β°F (32 Β°C) or higher of any populated place in the contiguous United States. en.wikipedia.org/wiki/Yum…
Japan uses high frequency noises that only young people can hear to disperse loitering teenagers bloomberg.com/news/articl…
The Iphone fingerprint sensors can differentiate between a living and dead. Apple-developed biometric uses radio frequency waves to check the skin underneath a finger's outer layer mashable.com/2017/11/15/s…
In a study of rhinotillexomania (compulsive nose-picking) in adolescents, almost the entire sample admitted to nose picking, with a median frequency of 4 times per day; the frequency was 20+ times per day in 7.6% of the sample. Nearly 17% considered that they had a serious nose-picking problem pubmed.ncbi.nlm.nih.gov/1…
Not only does Japan have the lowest sexual frequency in the world, it is also the only country where the percentage of people who are not happy with their sex life is higher than that of those who are. toyokeizai.net/articles/-…
Musical note frequencies were internationally standardized in the Treaty of Versailles en.wikipedia.org/wiki/Con…
In Portuguese universities, part of the official uniform is a long black cape. The cape is worn by males and females, together with a black jacket, black tie, and black trousers/skirt. There are strict rules on how to wear it, and the frequency that it is worn differs between universities comap-portugal.com/portug…
Top of the Pops, a music program, used to be very popular with deaf children in Britain, who enjoyed the visual content and lower-frequency notes en.wikipedia.org/wiki/Vis…
The discoverer of radio frequency, Heinrich Hertz, did not think his discovery was practically useful in any application. famousscientists.org/how-…
Marmorated stink bugs hatch in unison, cued by a vibration at a specific frequency. This is advantageous, as hatched larvae will eat other unhatched larvae, so any slowpokes would risk being devoured by their new siblings if they did not all hatch at the same time. sciencedirect.com/science…
The Arecibo message is a 1974 interstellar radio message carrying basic information about humanity and Earth sent to globular star cluster M13, which is about 25,000 light years away. The message was broadcast into space a single time via frequency modulated radio waves and forms a picture. en.wikipedia.org/wiki/Are…
There is a sound frequency that is said to induce a feeling of fear even when it is inaudible. sageaudio.com/blog/music-…
Today I learned of the Airborne Cigar, a British WWII system to jam German air force communications by locating their frequencies and broadcasting noise over them en.wikipedia.org/wiki/Air…
In 1859, the French government passed a law defining the frequency of musical notes, in the first move to standardize musical pitches. en.wikipedia.org/wiki/Con…
Men initiate sex more than 3x as often as women do in a long-term, heterosexual relationship. However, sex happens far more often when the woman takes the initiative, implying that it’s the woman who sets limits, and that frequency of sex depends on how enthusiastic a couple are about it. norwegianscitechnews.com/…
The accuracy of electric clocks depends upon the β€œfrequency” of the electrical grid because electric clocks use the alternating current of the electric grid as a metronome. When the frequency changes (usually due to changes in demand) electric clocks run slower or faster than they should. phys.org/news/2011-06-pow…
There are only two organs with 64β€² pipes (stops) in the world. The lowest note of these stops has a frequency of 8 Hz, which humans can just feel, not hear. en.wikipedia.org/wiki/Org…
Clocks ran behind in Europe in 2018 due to a power shortage caused by politics and when the dispute was resolved, they ran the power grid above frequency to fix clocks that were behind for a few weeks arstechnica.com/tech-poli…
Microwave ovens DON’T heat food using the β€œresonant frequency” of water. They work by causing polar molecules (water is one, and so are some fats) to rotate back and forth quickly in an oscillating electromagnetic field, producing molecular vibrations (heat). en.wikipedia.org/wiki/Die…
Today I learned about a Baader–Meinhof effect, also called Frequency illusion. It's a illusion in which the thing you've just noticed, experienced or been told about suddenly crops up everywhere. healthline.com/health/baa…
Infrasound, a sound wave with frequencies below 20 Hz making it unable to be heard by people, can cause recipients to feel fear, anxiety, sorrow, depression, and nausea; it has also caused recipients to see hallucinations which causes them to think of it as a paranormal/supernatural event. eastcoastrip.org/weather-…
That, according to a recent published paper, cats can sometimes heal themselves by purring. A domestic cat's purr has a frequency of between 50 and 150 Hertz, which is the frequency needed to speed healing time and boost strength and mobility, helping them retain bone density and muscle tone. petcentral.chewy.com/pet-…
The frequency of Earth magnetic pole shift varied; geomagnetic reversals have been recorded every 250,000 years, and according to some data, every 100,000 years. The magnetic south and north were last replaced about 780,000 years ago, so the new shift that many fears is already "late". needforscience.com/geolog…
Today I learned about Vic Tandy, an engineer who established a connection between supposed paranormal activity and infrasound frequency (~19Hz), which is below the range of human hearing and also roughly the resonant frequency of our eyeballs, causing some people to 'see' things that aren't there. gizmodo.com/some-ghosts-m…
Sharks love heavy metal because the low-frequency vibrations are similar to the sounds made by struggling fish independent.co.uk/news/sc…
As well as being the largest mammals, blue whales are also the loudest, producing low-frequency "pulses" that can be heard from more than 500 miles away. interestingfactspk.com/bl…
Mozart can reduce seizure frequency in people with epilepsy uhn.ca/corporate/News/Pag…
Yawning is more contagious among people who are emotionally close. An experiment found family members showed the greatest contagion, in terms of both occurrence of yawning and frequency of yawns, while strangers and acquaintances showed a comparatively longer delay in the yawn response. scientificamerican.com/ar…
The color of the Sun is a composite of all visible frequencies of light which makes it perfectly white. We see it yellow because of the Earth's atmosphere. In space the sun looks white. scienceabc.com/nature/uni…
The Human eyeball has a resonant frequency of 18Hz and may explain some ghost sightings en.wikipedia.org/wiki/Inf…
Humans are still evolving. One fast-evolving gene is human accelerated region 1 (HAR1), which is needed during brain development. In Tibet, a rapid surge in frequency of a mutated gene that increases blood oxygen content gives locals a survival advantage in higher altitudes. independent.co.uk/news/sc…
Our voices sound higher in recordings than they do when we speak because bones conduct low frequencies better. en.wikipedia.org/wiki/Bon…
β€ŽMr. Rogers made Friday the 13th lβ€Žess scary for children by naming the puppet who ruled the Neighborhood of Make Believe "King Friday XIII (13th)" --- and regardless of the month or frequency, every Friday the 13th was celebrated as King Friday’s birthday (see video starting at 0:45) emmytvlegends.org/blog/?p…
For the "Laurel" vs "Yanny" debate, by filtering the recording for only higher frequency sounds, you'd hear "Yanny" more clearly, and vice versa youtu.be/yDiXQl7grPQ
American adults are having sex less frequently. American adults had sex about nine fewer times per year in the early 2010s compared to the late 1990s due to an increasing number of individuals without a steady or marital partner and a decline in sexual frequency among those with partners. link.springer.com/article…
During the opening of 1936 Olympic,Adolph Hitler made a speech which was broadcasted in 41 countries.Due to the high frequency of the signal,it escaped the earth ionosphere.Carl Sagan wrote his book Contact,on alien-human encounter based on this platform that alien heard Hitlers voice first. en.wikipedia.org/wiki/Con…
A 39 story building in Seoul was evacuated after tremors were felt on the top floors. Instead of an earthquake, it was found that an exercise class on the 12th floor was playing Snap!'s "The Power", which happened to match the building's resonant frequency and caused it to violently shake. en.wikipedia.org/wiki/Tec…
Today I learned about HERA, a telescope searching for the oldest stars in the universe, from a period known as the Cosmic Dark Ages. And it is built from stuff you could buy at any local hardware store. "This is the beauty of low frequency radio astronomy: one doesn’t need custom, expensive hardware." supercluster.com/editoria…
MIT researchers were able to capture sound from a soundless video of a chip bag using a high FPS camera recording. All sound causes objects to vibrate and using advanced software, they were able to match the vibrations shown in the chip bag to the respective audio frequencies. news.mit.edu/2014/algorit…
Scientists were surprised to learn about the frequency of the earth's magnetic field reversals, which has flipped 26 times in the past million years nationalgeographic.com/sc…
Some humans can see some frequencies of ultraviolet light, with it appearing as a whitish-blue or violet. This is because they have no lens in their eye, due to surgical removal. wikipedia.org/wiki/Tetrac…
Why the sky is blue. White light (which is made up of all the colors) comes from the sun, and hits our atmosphere, which breaks it apart. Blue light has a higher frequency than most other colors, so it scatters much faster, filling our skies. chemforyourlife.transisto…
Today I learned of Radiofax, analogue mode for transmitting monochrome images via high frequency radio waves. en.wikipedia.org/wiki/Rad…
The song "What's the Frequency Kenneth?" was named after an incident involving Dan Rather being assaulted. The assailant believed NBC was beaming signals into his brain and, attempting to find and block the frequency of the signals, yelled "Kenneth, what is the frequency?!" as he beat Rather. en.wikipedia.org/wiki/Dan…
The physical shape of the human ear selectively filters out frequencies outside of the human vocal range. en.wikipedia.org/wiki/Aur…
Steve Jobs in 8th grade called then CEO of HP, Bill Hewlett for parts of his project to build a frequency counter and Bill not only agreed to give him parts but also offered a job at HP, assembling frequency counters. businessinsider.in/What-w…
Today I learned about mosquito ringtones. Mosquito ringtones emit high-frequency tones that are inaudible by adults but can be heard by teenagers. It is very normal for people to lose their hearing as they age. The loss of hearing is gradual in most people, while other may experience more severe hearing loss. noiseaddicts.com/2011/06/…
Today I learned that the upper bound of Extremely low frequency(ELF) radiation(mostly long radio waves) wavelengths is about 100,000 km, or 62, 000 miles. For comparison, the diameter of Saturn is around 75,000 miles. nasa.gov/directorates/heo…
Helium changes the sound of your voice because the speed of sound travels faster through the lighter material, so the resonances occur at higher frequencies. However, the flesh in your vocal folds still vibrates at the same frequency. animations.physics.unsw.e…

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