r/todayilearned 7h ago Ally

TIL, despite its vastness, it only takes 39-40 digits of pi to calculate the size of the observable universe to an accuracy of 1 hydrogen atom. Because of this, NASA uses only 15 digits of pi in even their highest accuracy calculations.

Thumbnail jpl.nasa.gov
11.7k Upvotes

r/todayilearned 13h ago

TIL Consumers lose $3 billion a year in unspent gift cards, with starbucks itself having $140 million in unused gift cards.

Thumbnail cnbc.com
8.5k Upvotes

r/todayilearned 17h ago

TIL Roughly 2.5 billion people watched princess Diana’s funeral in 1997. At its height the queue to reach the book of condolences took 6.5 hours. The queen gave her first live broadcast in 50 years

Thumbnail rd.com
6.2k Upvotes

r/todayilearned 22h ago Silver Helpful

TIL of the ancient Greek athlete Theagenes. After his death, a rival athlete who held a grudge would beat his statue. The statue fell on his rival, killing him. It was then put on trial, convicted of murder and was exiled by being thrown into the sea.

Thumbnail en.wikipedia.org
13.6k Upvotes

r/todayilearned 1d ago Wholesome Helpful

TIL living next to a landfill greatly increases your risk of developing all kinds of health issues including tuberculosis

Thumbnail sciencedirect.com
36.2k Upvotes

r/todayilearned 14h ago

TIL the billionaire founder of Duty Free Shoppes is a lifelong renter and has donated his entire $8 Billion fortune to philanthropic initiatives

Thumbnail en.wikipedia.org
1.2k Upvotes

r/todayilearned 2h ago

TIL When Caesar said, 'the die is cast' he was quoting a comedian. The phrase comes from Arrhephoros, a play by the Greek comedian Menanders, and Caesar originally said it in Greek.

Thumbnail en.wikipedia.org
116 Upvotes

r/todayilearned 8h ago

TIL that time dilation is the reason we can use muon tomography to scan the Great Pyramids. From their point of view, muons only live a very short time. But they go so fast that from our point of view, they live long enough to penetrate the atmosphere and large objects.

Thumbnail en.wikipedia.org
293 Upvotes

r/todayilearned 11h ago

TIL that milk is sprayed on vineyards to prevent grapes from becoming mildewed.

Thumbnail nature.com
445 Upvotes

r/todayilearned 23h ago

TIL that in 1983, Hasbro executives travelled to to the Tokyo Toy Show to look for new toys they could release in the United States. After finding a series of transforming robot toys, they teamed with Marvel Comics to create a comic book and animated series--"Transformers"--to sell the toys.

Thumbnail en.wikipedia.org
4.1k Upvotes

r/todayilearned 5h ago

TIL in 1965 the first Channel Crossing by car took place, using 2 Amphicars, the first amphibious mass-produced automobiles. They then drove to Frankfurt.

Thumbnail transportationhistory.org
107 Upvotes

r/todayilearned 20h ago

TIL about the Elephantine Colossus: A 200-foot-tall elephant-shaped hotel that was built on Coney Island in 1885, that housed a concert hall, museum, observatory, and more. It later became a brothel but burnt down on 27th September 1896 following a mysterious incident.

Thumbnail somethingcurated.com
1.3k Upvotes

r/todayilearned 1h ago

TIL in the Haitian Creole language, the definite article (equivalent to 'the') is placed after the noun

Thumbnail en.wikipedia.org
Upvotes

r/todayilearned 1h ago

TIL that ancient Britons come mainly from Spain

Thumbnail standard.co.uk
Upvotes

r/todayilearned 2h ago

TIL, that Babe Ruth once crashed his car on his way to an exhibition game. Not wanting to miss the game, he hitchhiked the rest of the way.

Thumbnail ghtbl.org
25 Upvotes

r/todayilearned 23h ago

TIL firecrackers were banned in Canada 50 years ago when some kids died in a tent fire.

Thumbnail en.wikipedia.org
1.2k Upvotes

r/todayilearned 10h ago

TIL: Mercia was one of the three notable Anglic kingdoms founded after as Sub-Roman Britain was settled by Anglo-Saxons. It was centred around the River Trent and its tributaries, in a region now known as the Midlands of England.

Thumbnail en.wikipedia.org
103 Upvotes

r/todayilearned 1d ago

TIL NASA research has created over 1920 Spinoff products. NASA Spinoffs include memory foam, DustBusters, and cochlear implants. But contrary to common belief, NASA did not invent Tang, Velcro, or Teflon.

Thumbnail en.wikipedia.org
1.9k Upvotes

r/todayilearned 17h ago

TIL that stimulating a specific region of the hypothalamus can induce a male mouse to mate rather than attack another male mouse. Conversely, stimulating a different hypothalamus region can induce the male mouse to attack rather than mate with a female mouse.

Thumbnail caltech.edu
349 Upvotes

r/todayilearned 11h ago

TIL Harry Dean Stanton taught Paul Newman to play "Plastic Jesus" on the banjo for his scene in Cool Hand Luke.

Thumbnail slashfilm.com
106 Upvotes

r/todayilearned 44m ago

TIL that the picture of George Washington on the $1 bill is based off an unfinished portait of him.

Thumbnail npg.si.edu
Upvotes

r/todayilearned 1d ago Silver Wholesome

TIL in 1983, NFL Chiefs running back Joe Delaney sacrificed his life in an attempt to save three children from drowning. His number is unofficially retired by the team and a statue was put up in his hometown.

Thumbnail arrowheadpride.com
22.7k Upvotes

r/todayilearned 14m ago

TIL that Cass Elliot, of The Mamas & The Papas, and Keith Moon, of The Who, died four years apart in the same bedroom in London. Both were 32 years old.

Thumbnail faroutmagazine.co.uk
Upvotes

r/todayilearned 22h ago

TIL heroin (diacetylmorphine) was introduced as a non-addictive substitute for morphine, and trademarked and marketed by Bayer from 1898 to 1910 as a cough suppressant and over-the-counter treatment for other common ailments

Thumbnail en.wikipedia.org
640 Upvotes

r/todayilearned 1d ago

TIL; Wally Feresten has worked with every “Saturday Night Live” cast member for the last 30 years as the "cue card guy".

Thumbnail southcoasttoday.com
952 Upvotes