Word and fact of the day: Wednesday, October 21, 2026

Peabody's word of the day for October 21, 2026 is "slippery" (so smooth or wet that things slide) at level 2, up to "diaphanous" at level 8, with a fact at each of levels 1 to 13. Words and facts come from Peabody's own banks, with no AI, and are free through the end of 2026.

By Aaron, founder of PeabodyChecked 21 October 2026

Level	Word of the day	What it means	In a sentence
2	slippery	so smooth or wet that things slide	The ice on the pond is slippery.
3	vanish	disappear all of a sudden	The rabbit vanished from the magic hat.
4	cluttered	messy and full of things	My cluttered desk had no room for my book.
5	turbulent	rough and full of wild movement	The turbulent river tossed the canoe.
6	camouflage	colors that help you blend in	The frog's camouflage hid it in the leaves.
7	cacophony	a harsh mix of loud sounds	The cacophony of honking geese woke us.
8	diaphanous	so thin you can see through it	The dragonfly's diaphanous wings sparkled.

Fact of the day

Level	Fact	From
1	Beep does just what we say.	Walk the Robot (Code & Robots)
2	Move your body every day. Run, jump, dance or ride a bike. Moving makes you happy and keeps you strong.	Strong and Well (Health)
3	The Ute people have lived in the mountains for a very long time. They moved with the seasons. They went up high in summer and down low in winter. On the flat plains to the east, the Cheyenne and Arapaho people followed big herds of bison. Bison gave them food, warm robes, and skins for their homes.	Colorado's First Peoples (History)
4	How does an orchestra make so many sounds? An orchestra is a big group of people who play music together. The things they play are sorted into four families, called strings, woodwinds, brass and percussion. Each family makes its sound in its own way. But every sound starts with something that shakes back and forth very fast. That fast shaking is called a vibration, and you can feel it if you touch a drum while it plays.	Instrument Families (Music)
5	How do you finish a job that feels too big? A big job, like a science project or a very messy bedroom, can feel heavy before you even begin. The secret is to break it into smaller steps. Each small step is something you can finish in a short time. Whenever you complete one step, the big job becomes a little smaller, and you feel more ready for the next one.	Big Jobs, Small Steps (Think)
6	How do you ask what time it is in Spanish? You say ¿Qué hora es? A question in Spanish starts with an upside-down question mark and ends with the one you already know from English. To answer at one o'clock, you say Es la una, which means It is one, but for every other hour, you say Son las and then the number of the hour. So at two o'clock you say Son las dos, and at ten o'clock you say Son las diez. The first word changes from Es to Son because one o'clock is just one hour, while two o'clock and every hour after it are more than one.	¿Qué hora es? (Languages)
7	If a muscle can only pull, how do you straighten your arm again after you bend it? The answer is that muscles work in pairs that pull in opposite directions. Your biceps is the muscle on the front of your upper arm, and when it contracts, it pulls your forearm upward and bends your elbow. Your triceps is the muscle on the back of your upper arm, and when it contracts, it pulls the other way and straightens your elbow. While one muscle in the pair is pulling, its partner relaxes and allows itself to be stretched.	Muscles in Pairs (Move)
8	Because the algorithm keeps showing you more of what you already watch, your feed can gradually narrow until it displays mostly one kind of idea or opinion. That can make it seem as though everyone agrees, even when many people see things quite differently. Fortunately, you can stay in charge. Choose what to watch on purpose instead of letting autoplay choose for you, and decide on a time to stop before you begin. Take regular breaks, and search for other points of view on purpose. If your feed ever shows you something upsetting, stop watching and tell a trusted grown-up.	Why You See What You See (Online)
9	How can an argument sound convincing but still be faulty? An argument gives reasons, called premises, that are meant to support a conclusion. A logical fallacy is a mistake in reasoning that makes an argument weaker than it looks, even when it seems persuasive at first. One common fallacy is called ad hominem, a Latin phrase meaning against the person, because it attacks the person who is making an argument instead of the argument itself. Suppose Maya suggests that the school should put a recycling bin in the lunchroom, and Theo replies that Maya can't even keep her locker neat, so her idea must be silly. Theo has said nothing at all about whether a recycling bin would actually help, and whether Maya's locker is messy has nothing to do with whether her suggestion is a good one.	Spotting Logical Fallacies (Think)
10	One of the most important tools was linear perspective, the system you may know from drawing with vanishing points. Early in the 1400s, the architect Filippo Brunelleschi worked out its basic rules in Florence, and a few years later the writer Leon Battista Alberti explained the method for painters in a book called On Painting. With these rules, a painter could make a floor of tiles seem to stretch far back into a room. Artists also used aerial perspective, which creates depth with color instead of lines. Faraway hills are painted paler, bluer and less sharp than nearby ones, the same way distant mountains look on a hazy day. Leonardo da Vinci gave this method its name, and he wrote that colors grow weaker the farther they are from the person looking at them.	The Renaissance (Art)
11	What happens if a programmer forgets the base case? Each call would make another call, which would make another, with nothing ever telling the chain to stop, so in theory the calls would continue forever. In practice, a computer keeps track of every unfinished call in a region of memory called the call stack, and that space is limited, so the program eventually runs out of room and stops with an error, often called a stack overflow. Programmers prevent this by checking two things: that a base case exists, and that every recursive call moves closer to it, the way factorial(n minus 1) moves one step nearer to 1. Recursion is especially useful for problems that naturally contain smaller copies of themselves, such as searching through folders that are stored inside other folders.	Recursion (Code & Robots)
12	Why would a country buy something from abroad that it could make at home? The answer begins with opportunity cost, which the Federal Reserve Bank of Dallas explains as the most valuable alternative that must be given up in order to obtain something else. Every country has a limited supply of workers, land, machines and other productive resources, so using those resources to make one product means that they cannot simultaneously be used to make another. When a factory is used to build cars, for example, the tractors it could have built instead are the opportunity cost of those cars. Economists compare countries partly by examining what each one can produce with its available resources. A country has an absolute advantage in a good if it can make that good using fewer resources than another producer, but, perhaps surprisingly, absolute advantage is not what makes international trade worthwhile for both sides.	Why Countries Trade (Money)
13	These harmonics line up neatly with familiar musical intervals. The second harmonic, which vibrates twice as fast as the fundamental, sounds one octave higher, because a ratio of two to one is exactly what defines the octave. The third harmonic, at three times the fundamental, sounds an octave and a perfect fifth above it, and the fourth harmonic sounds two full octaves above it. Under ordinary conditions, a listener hears the fundamental clearly while the overtones blend into it without being noticed, although with practice and careful attention the overtones themselves can sometimes be picked out one by one. Not every instrument follows this tidy pattern, however. Bars of metal or wood, like the bars of a marimba, along with cymbals, chimes and drums, produce what are called nonharmonic overtones, whose frequencies are not whole-number multiples of the lowest one, so their overtones do not line up neatly with the harmonic series.	Overtones and Timbre (Music)

Each fact is a page from one of Peabody's World trails, which carry named sources; this one cites Code.org CS Fundamentals: sequencing with arrows.

How the day's picks are made

Nothing is written for the day and nothing is asked of a child. The date picks one word from each level's bank of 40 words and one fact from each level's bank (61 facts at level 1, 63 facts at level 2, 53 facts at level 3, 50 facts at level 4, 49 facts at level 5, 39 facts at level 6, 39 facts at level 7, 39 facts at level 8, 39 facts at level 9, 39 facts at level 10, 38 facts at level 11, 39 facts at level 12 and 39 facts at level 13), visiting each before any repeats. The levels are Peabody's own thirteen; the word bank covers levels 2 to 8, the fact bank levels 1 to 3.

Keep going

Questions parents ask

How do I use the word of the day?

Say the word and its meaning at dinner, look for it in a book, and use it once yourself. Then see if your child spots it.

Which level should my child read?

Pick the row near the reading level Peabody shows for them. Level 2 is early readers and level 8 is a strong middle-school reader; the levels and grades page shows where each grade starts.

Is it free?

Yes, free through the end of 2026, with no sign-up.

Checked against how Peabody works on 21 October 2026. Written with help from AI, from Peabody's own code and library. Peabody is a learning app, not an assessment: if you're worried about your child's learning, talk to their teacher.