Longtime readers of Today You Should Know may recognize this question β it's a repeat! Life has been very full lately (in good ways, fortunately!), and I'm trying to be better at taking rest when I need it. So please enjoy this re-run of a newsletter all about Κ°αΆ¦α΅Κ°β»α΅αΆ¦α΅αΆΚ°α΅α΅ voices. All my best, π Caitlin Why does helium make your voice higher? π The short answer When you inhale helium, the gas's lower density speeds up sound waves, amplifying higher frequencies in your voice while dampening...
9 days agoΒ β’Β 3 min read
Why is the "ring finger" the ring finger? This question came from a reader submission (thanks Rayvan!). Has a curious question stumped you lately? Feel free to submit your own question here: Submit your question π The short answer We typically wear rings on the βring fingerβ because the ancient Egyptians believed a special vein ran from the fourth finger on the left hand straight to the heart. The Romans later gave this idea a romantic name: the βvein of love.β π The long answer Humans (and...
16 days agoΒ β’Β 4 min read
How do QR codes work? This question came from a reader submission (thanks Nathan!). Has a curious question stumped you lately? Feel free to submit your own question here: Submit your question π The short answer A QR code is a binary message your camera can read. The grid of black and white squares encodes data, while built-in structural markers tell the scanner how to orient the code, how it's formatted, and how to reconstruct any missing pieces. π The long answer Back in the 1990s, Masahiro...
23 days agoΒ β’Β 6 min read
How do contact lenses work? This question came from a reader submission (thanks anonymous!). Has a curious question stumped you lately? Feel free to submit your own question here: Submit your question π The short answer Contact lenses correct refractive errors, like nearsightedness, farsightedness, and astigmatism, by using precisely shaped lenses to bend incoming light so it lands on the retina instead of in front of or behind it. π The long answer As someone with a mild aversion to putting...
about 1 month agoΒ β’Β 5 min read
Why do nuthatch birds walk upside down? This question came from a reader submission (thanks Nancy!). Has a curious question stumped you lately? Feel free to submit your own question here: Submit your question π The short answer Nuthatches climb down trees headfirst to forage more efficiently. By approaching the bark from above, they can spot hidden food that upward-climbing birds may miss. π The long answer Say hello to the nuthatch. ππ "Sitta-carolinensis-001" by Mdf is licensed under CC...
about 1 month agoΒ β’Β 4 min read
Can the brain heal itself after a stroke? This question came from a reader submission (thanks Aunt Genie!). Has a curious question stumped you lately? Feel free to submit your own question here: Submit your question π The short answer After a stroke, the brain can reorganize its neural pathways to recover lost functions through neuroplasticity. The best way to promote healing is consistent practice of the affected functions, like deliberately using the weaker side of the body for everyday...
about 1 month agoΒ β’Β 7 min read
Why do coconuts have water? This question came from a reader submission (thanks Akaal!). Has a curious question stumped you lately? Feel free to submit your own question here: Submit your question π The short answer Coconuts carry water because theyβre designed to launch a seed with an immediately usable food reserve. This liquid endosperm supports early growth, while the meat provides sustained fuel as the seedling develops. π The long answer Coconuts are an unusual fruit (yes, they are a...
about 2 months agoΒ β’Β 5 min read
Why does alcohol make you feel warm? π The short answer Alcohol feels warming because ethanol lowers the activation threshold of heat-sensitive receptors, fooling your nervous system into thinking youβre overheating. Your body then attempts to cool itself by dilating blood vessels and sending warm blood to the skinβs surface. π The long answer Normally, a beverage needs to be warm to make you feel warm β but not alcohol. Whether it's a burning sensation from taking a shot or a more gentle...
about 2 months agoΒ β’Β 5 min read
What does "feels like" temperature mean? This question came from a reader submission (thanks Nikilah!). Has a curious question stumped you lately? Feel free to submit your own question here: Submit your question π The short answer βFeels likeβ temperature reflects how wind and humidity change how cold or hot the air feels to the human body. Wind chill increases heat loss in cold conditions, while the heat index reflects how humidity interferes with sweating in hot weather. π The long answer...
2 months agoΒ β’Β 5 min read