Why do some vehicle wheels look like they're rotating in the opposite direction to their vehicle's motion?
Basically, the human brain isn't quite fast enough to capture things when they're in motion, even if we're picking up the light at a rate that we can comprehend.
This illusion is known as the 'wagon wheel effect' and it all comes down to the function of the human eye and the way in which our brain manages to interpret and process the images it is presented with. The human eye is capable of operating at frame rates upwards of 200 frames per second (FPS) when processing light but things work differently when it comes to detecting motion. Studies have shown that the human visual system can detect changes in motion - like a wheel spinning - up to only 13 FPS.
Although your eyes can detect frame rates higher than that, the brain can generally only compute and react to 10-15 images per second, although this figure can be increased with specific brain training and depending on which part of the eye is reporting back the information.
https://www.carthrottle.com/news/why-do-wheels-look-they-rotate-backwards-certain-speed (maripp2002)
1 answer
Nov 07 25 by odo5435
According to legend, Pope Julius II was one of the many owners of which famous diamond, cut in the 15th century by a Flemish jeweler for a Burgundian duke?
The Florentine Diamond
[quote]Florentine diamond, clear, pale-yellow stone weighing 137 carats; of Indian origin, it was cut as a double rose with 126 facets. Once owned by Charles the Bold, duke of Burgundy, who lost it when he fell in battle in 1477, the stone came into the possession of Pope Julius II and the Medici family early in the 16th century. Maria Theresa of Austria acquired it through her marriage (1736) to the Duke of Tuscany, and it subsequently became part of the Austrian crown jewels. Seized by the Germans when they took over Austria just before World War II, it was recovered by the U.S. 3rd Army and returned to the Viennese by Gen. Mark Clark.[/quote]
https://www.britannica.com/topic/Florentine-Diamond (elburcher)
1 answer
Nov 06 25 by pehinhota
1 answer
Nov 06 25 by odo5435
Before becoming an umbrella term for all music produced in the Philippines, what did OPM (Original Pilipino Music) *specifically* refer to?
The term OPM was originally used to distinguish locally composed music from foreign imports and referred to songs written and performed in the Philippines in Filipino (Tagalog) or other local languages. Popular genres included ballads and love songs, which were particularly prevalent in the 1970s.
[quote]Original Pilipino Music (...) originally referred only to the pop genre of music from the Philippines, predominantly ballads and novelty numbers, that became popular after the wane of its direct 1970s commercial predecessor, Manila sound. The term "OPM" became a catch-all description for all popular music of any genre composed, performed and recorded by Filipinos in the Philippines, originating from the Philippines.[/quote]
https://en.wikipedia.org/wiki/Music_of_the_Philippines?utm_source=chatgpt.com#Popular_music (wellenbrecher)
1 answer
Nov 05 25 by Thesuperyoshi
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Nov 05 25 by pehinhota
2 answers
Nov 03 25 by GBfan
What high school did Prince attend in Minneapolis?
Prince (Prince Rogers Nelson) attended Minneapolis Central High School, which closed in 1982 - about 6 years after Prince graduated from it.
https://en.wikipedia.org/wiki/Central_High_School_(Minneapolis,_Minnesota) (SixShutouts66)
2 answers
Nov 03 25 by GBfan
2 answers
Oct 31 25 by odo5435
In the animal world, which male marine mammal has the largest testicles, each weighing 500 kg, or 2% of the body weight?
[quote]Testes come in all shapes and sizes in the animal kingdom. However, nothing can compare in size to the southern right whale's testes. Each testicle can weigh up to 500kg- 900kg. Each! That's about as heavy as a newborn gray whale or an adult horse! This weight also accounts for about 2% of an adult male southern right whale's body weight. So why on earth would they need such massive testes? Scientists think it has to do with how southern right whales mate. [/quote]
https://whalescientists.com/southern-right-whale-males/
(wellenbrecher)
2 answers
Oct 21 25 by pehinhota
2 answers
Oct 31 25 by odo5435
In how many countries does an absolute monarchy still exist today?
If refereeing to the United Arab Emirates (UAE), there are conflicting references. I did find one that says the UAE essentially functions as an absolute monarchy despite having a Federal Systema with both a Prime Minister and a President. That said the vast majority of references I scoured, don't list it as such.
[quote]The United Arab Emirates and absolute monarchy
The United Arab Emirates is a despotic monarchy despite having a federal system with a president and prime minister.
The UAE's federal system comprises seven different monarchies comprising those of the Emirates of Dubai, Fujairah, Ajman, Umm al-Quwain, Abu Dhabi, and Ras al-Khaimah.
Despite seeming to be a constitutional, democratic nation, going by the information above, nothing could be further from the truth. The UAE has been called autocratic by many people.
The UAE is an autocracy that has the appearance of a modern contemporary state, but it is actually a tribal autocracy governed autocratically by the tribal rulers of each of the seven monarchies in the UAE's federation.
Democratically elected institutions do not exist, nor does freedom of speech.[/quote]
https://journeyz.co/countries-absolute-monarchy/ (elburcher)
3 answers
Oct 26 25 by pehinhota
3 answers
Oct 26 25 by pehinhota
Who was the first living Australian to appear on an Australian postage stamp?
Gwoya Tjungurrayi also known as One Pound Jimmy was an aboriginal elder and lawman of his people and died in 1965 at age of 70. He was photographed in 1935 and the image was used in September 1936 issue of a tourism magazine called "Walkabout". The image was subsequently used on a 8 1/2 pence stamp and a half crown stamp in 1950 making him the first aboriginal and living Australian to be featured on a postage stamp. It is to be noted that his name was not used with the image on the stamp.
https://en.wikipedia.org/wiki/Gwoya_Tjungurrayi
(sam388)
1 answer
Oct 28 25 by pehinhota
After the Danube Delta where is the second largest contiguous reed area in Europe?
Lake Neusiedl which is located on the border of Austria and Hungry.
[quote]Located directly at the Austrian-Hungarian border, the westernmost steppe lake in Europe can be found, Lake Neusiedl. The vast reed belt surrounding the shallow endorheic lake (around 180 km² in total, 100 km2 are located on the Austrian side), represents the second largest contiguous reed belt in Europe and provides a habitat especially for invertebrates, amphibians and birds.[/quote]
https://alfawetlands.eu/wp-content/uploads/2024/12/CFS_Austria_English_final.pdf (elburcher)
1 answer
Oct 26 25 by pehinhota
3 answers
Oct 26 25 by pehinhota
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Oct 26 25 by serpa
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Oct 26 25 by pehinhota
What is the value of 2x^4 / x^3 when x = 0?
This is a nice example of a discontinuous function, meaning it does not exist for all possible values of x. When x has any value other than x=0, the expression is equivalent to 2x. A graph would look like a straight line, gradient 2, passing through the origin - but with a hole at the exact point where it should go through the origin.
https://en.wikipedia.org/wiki/Continuous_function#Examples_of_discontinuous_functions (looney_tunes)
4 answers
Oct 23 25 by Lottie1001
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