Recent comments in /f/todayilearned
Marzgog t1_j7qj8dt wrote
Reply to comment by Ok-disaster2022 in TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993. by j-merc23
My country has among the highest rates of literacy in the world and our exit signs are green. I don’t think inclusivity has anything to do with exit signs going green, it’s just one of those universal standards in the making.
[deleted] t1_j7p8d0d wrote
Reply to comment by undefined7196 in TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993. by j-merc23
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worthrone11160606 t1_j7p7yik wrote
Reply to comment by slawre89 in TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993. by j-merc23
Facts
Admetus t1_j7opryj wrote
Reply to comment by nocrashing in TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993. by j-merc23
Also wouldn't the internal resistance of the batteries mean those blue LEDs were drawing less than 5V? 🤔
MastermindX t1_j7op8ez wrote
Reply to TIL that physically acting out your dreams (loss of REM sleep paralysis) is >80% accurate at predicting future brain maladies including Parkinson's, Lewy Body Dementia, and ALS by SimilarLee
Great, another thing to be worried and obsessed about.
tero999 t1_j7oof6s wrote
Reply to TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993. by j-merc23
LGR has a great video about blue LED https://www.youtube.com/watch?v=yoTALRhAqWc
slawre89 t1_j7og8sp wrote
Reply to comment by 4Blu in TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993. by j-merc23
Researchers hate teaching
Teachers hate researching
Either way in academia you’re forced to do both
ozyx7 t1_j7oeneq wrote
Reply to comment by WillTFB in TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993. by j-merc23
Eyes evolved to be most receptive to things of interest.
Things in nature that are green are very interesting. For example, plants. It's probably important to be able to focus on those, especially if you're arboreal.
Things in nature that are yellow or red are also interesting. For example, fruits, blood, and poisonous things.
Things in nature that are blue are much less common. By far, the most prevalent blue thing we encounter is the sky, and that isn't something that we need to focus on.
ultradip t1_j7odags wrote
Reply to TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993. by j-merc23
Waiting for u/TechConnectify to regale us on the evils of blue LEDs...
OccamsMallet t1_j7oanvo wrote
Reply to TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993. by j-merc23
I remember buying blue LED Christmas lights back in the day ... they were so expensive but looked so cool. Now they are stuck in throw-away plastic signs.
realmealdeal t1_j7oacjp wrote
Reply to comment by SAT0725 in TIL about Rob McKuen, the bestselling poet in American history who sold 60 million books and 100 million records but is all but forgotten today by SAT0725
I'll counter with Margaret Atwood, but that might just be a Canada thing.
willardTheMighty t1_j7oa1d1 wrote
Reply to comment by jcd1974 in TIL about Rob McKuen, the bestselling poet in American history who sold 60 million books and 100 million records but is all but forgotten today by SAT0725
What about the lauded warrior-poets Eazy-E and Ice Cube?
Vanish_7 t1_j7o8kf1 wrote
Reply to TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993. by j-merc23
(*looks around at BattleStation, currently 100% enveloped by blue LED light*)
Hmm. Glad that shit got worked out.
Dumguy1214 t1_j7o2c6y wrote
Reply to comment by mobugs in TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993. by j-merc23
the blue led needed a phosphorus layer to get white
​
they found out 2021 a led that does not need it
I use leds to grow weed
the_hell_you_say t1_j7o1cy1 wrote
Reply to TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993. by j-merc23
I was working the night shift in an electronics lab around the time when blue LEDs became cheap. I took apart my desk phone and replaced the red "you have voicemail" LED with a blue one. I always left voicemail in my inbox after that.
Salami-Vice t1_j7o0pto wrote
Reply to comment by undefined7196 in TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993. by j-merc23
Also allowed for the phosphorus converted amber (PC Amber). A bit lighter in tone than a regular amber which is very orangy. Thermally stable like a white, losing only 10-15% of its lumen output at operating temps vs the regular amber which would see 50% loss. Game changer for emergency lighting.
detelini t1_j7nwaui wrote
Reply to TIL: Fort Ross is a former Russian establishment and the southernmost Russian settlement in North America. by MrRhythm1346
I live maybe an hour or so from Fort Ross. It's a pretty interesting place, although very small. It's hard to imagine how incredibly isolated these people must have been. There would have been small bands of native people, and they weren't too far (at least by today's standards) from small Mexican settlements, but pre-Gold Rush California was pretty sparsely populated and they were very far from home.
Anicron t1_j7nw54v wrote
Reply to comment by nVr78 in TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993. by j-merc23
Underrated
ITeechYoKidsArt t1_j7nvcrb wrote
Reply to comment by majinspy in TIL about Rob McKuen, the bestselling poet in American history who sold 60 million books and 100 million records but is all but forgotten today by SAT0725
Yeah the comparisons people are throwing around are kind of ridiculous. The guy sounds mostly harmless. I mean he’s most famous for a poem about his cat. Spoiler the cat ran away.
shalafi71 t1_j7ntsek wrote
Reply to comment by ItDoesntMatter59 in TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993. by j-merc23
I was arguing with a (much smarter) friend about resistors one day. He insisted that if you got the voltage right, you didn't need one. "Dude, LEDs pull amps until they burn, sometimes instantly. You have to either get stupid lucky with current and voltage or you have to use a resistor."
To this day he doesn't believe me. "Dude, take a $1 store light apart, there's a resistor soldered onto the hot lead. Every. Time. Why would China put unneeded parts in there?!"
mighty_boogs t1_j7ns78p wrote
Reply to TIL about Rob McKuen, the bestselling poet in American history who sold 60 million books and 100 million records but is all but forgotten today by SAT0725
Meh. He had his season in the sun.
cancercauser69 t1_j7nrpvm wrote
Reply to TIL about Rob McKuen, the bestselling poet in American history who sold 60 million books and 100 million records but is all but forgotten today by SAT0725
Great poems and great ballads but I've met many people who absolutely hate him. Read his book about his search for his father, it's pretty good
BrokenEye3 t1_j7rjncy wrote
Reply to comment by fuckswitfish in TIL different kinds of tea (black, green, white, oolong) come from the same plant. The only difference is in how the leaves are processed. by wombat-slayer
THEY SAID THE DIFFERENT KINDS OF TEA COME FROM THE SAME PLANT!