Imagine Earth as a button. I don’t mean you’re going to sew it onto your shirt. But imagine the planet Earth shrunk to the size of a button. (Of course Earth is not flat like a button but we’re giving our shrunken Earth the same diameter as a shirt button.)
Go ahead and draw a circle around a shirt button. Call it “Earth.” Suppose you wanted to draw Jupiter, the largest planet, at the same scale as this micro-Earth. That means you’re going to shrink it to the same fraction of its original size as our button-Earth. What size would little Jupiter be?
One way to find out would be to calculate how many times bigger the real Jupiter is than the real Earth. Earth’s diameter is about 8,000 miles (13,000 kilometers). Jupiter’s is about 88,000 miles (143,000 km). Divide the size of Jupiter by the size of Earth to see that Jupiter is about 11 times bigger.
So, since Jupiter’s diameter is 11 times that of Earth’s, put 11 buttons in a line to show the diameter of Jupiter. Then draw the circle that represents Jupiter. If you don’t have 11 buttons, just look at the picture. Did you think the Earth was a big place? Look at it compared with Jupiter!
But what about the sun? The sun’s diameter is about 865,000 miles (1,400,000 km). That means it’s almost 10 times bigger than Jupiter. Can you find a way to draw a circle 10 times the size of our Jupiter? We’ve drawn part of it for you, on the same scale as our button-sized Earth. On the picture, it’s labeled “our arc.” (An arc is part of a circle.) Looking at the arc, you can imagine the rest of the circle and compare the sun to Jupiter and Earth. A minute ago, you thought Jupiter was big. Now it looks shrimpy compared to the sun!
But is the sun really gigantic? Do some research to find out the size of a red giant star like the strangely named Betelguese (pronounced “beetle-juice.”) Figure out what it looks like compared to our sun, which is a medium-sized star. You may be amazed at the difference. And you thought the sun was big!
Is anything truly big? Is anything truly small? Or does that depend on what it’s being compared to?
Both images are by Marissa Moss, the illustrator of David M Schwartz's book, G is for Googol.
If the Earth were the size of a button,
Jupiter’s diameter would equal eleven
buttons because the diameter of
Jupiter is eleven times that of Earth.
G is for Googol: A Math Alphabet Book is a wonder-filled romp through the world of mathematics.
For more information, click here.
David Schwartz is a member of iNK's Authors on Call and is available for classroom programs through Field Trip Zoom, a terrific technology that requires only a computer, wifi, and a webcam. Click here to find out more.
Which lunch food has a shape that resembles a falling raindrop?
b. potato chip
c. hot dog
d. hamburger bun
e. all of the above
f. none of the above
If you chose (f), you’re like most people who think raindrops are shaped like tears.
If you chose (e), you’re probably just hungry.
In either case you’re wrong.
That leaves us with lunch. Let’s start from the top.
Choice (a), orange, is a sphere. Water droplets are spherical because water is cohesive, meaning it sticks to itself. The “skin” that holds the drop together is surface tension and the reason insects can walk on water.
If you chose (a), you made a logical choice based on the properties of water, but you are wrong. Notice that you were not asked to identify the shape of a raindrop sitting on a leaf. You were asked to identify the shape of a falling raindrop. (Always read questions carefully!)
Moving down the list to (b), we encounter the potato chip. Potato chips come in many shapes, ranging from relatively flat to completely crumpled. Have you ever seen a raindrop that looks even a little bit like a potato chip? If you chose (b) you are wrong, but have a good sense of humor.
Choice (c), hot dog, is an interesting option. Could a spherical drop of water morph into the cylindrical shape of a hot dog? After all, a hot dog is a cylinder with a hemisphere (half sphere) on each end. Could a water droplet in free fall separate itself into two hemispheres with a long drip of water in between? Although this is an imaginative idea, the laws of physics make it impossible.
Choice (d), hamburger bun, is the only remaining choice, and is the correct answer. Here’s why:
A raindrop is acted upon by three forces: gravity, buoyancy, and drag. Gravity is the force that pulls the drop toward the earth, while buoyancy of the surrounding air pushes it upward and keeps it from falling. When the force of gravity is greater than the force of buoyancy, the raindrop falls. The air around it creates drag, slowing the drop down to its maximum speed. In the process, the sphere is distorted into a shape that resembles a hamburger bun.
Got it? Now, you may go to lunch.
Bugs bite, drink blood, and rob food from gardens and fields. They can even kill plants, animals, and, occasionally, people. Is bugging a crime? In her book, Bug Shots, Alexandra Siy compiles "rap sheets" on several of the major categories of bugs and takes a very close look at some of the types of insects in an engaging text. For more information, click here.
Alex Siy is a member of iNK's Authors on Call and is available for classroom programs through Field Trip Zoom, a terrific technology that requires only a computer, wifi, and a webcam. Click here to find out more.
When eighteen-year-old Victoria was crowned queen of England in 1837, the British wondered and worried who their very young queen would marry. Whoever he was, he would have power and influence, so the queen’s choice was critical.
Victoria had many royal suitors and was getting advice from all directions about which alliance with which suitor would be most advantageous for England. But as the British quickly learned, their new queen had a mind of her own, and she had already picked Prince Albert of Saxe-Coberg, an area of what is now Bavaria, Germany.
The British were shocked! Royalty often intermarried, so it wasn’t because Victoria and Albert were first cousins—her mother and his father were sister and brother—but because there was a great deal of anti-German sentiment in England at the time. Victoria didn’t care. He was her “dear Albert” and they were married in 1840 when they were both twenty-one. They loved each other and were determined that theirs would be a happy marriage.
The odds were against this. Neither Albert nor Victoria had grown up in happy families—in fact, both had been exposed to mostly miserable marriages—and Victoria was spoiled, stubborn, and had a quick temper. Fortunately, Albert was a kind man who understood her well and knew how to be patient with her. That patience was put to the test many times as they raised their nine children. Victoria disliked being pregnant and wasn’t fond of babies and toddlers. But Albert provided balance. He doted on their four sons and five daughters and was closely involved in their care and education.
The British public adored the royal family, and they came to love the scholarly Albert. He became a British citizen, was a wise political advisor to Victoria, and was active in public life. When he died from stomach problems in 1861 at age forty-two, the British grieved for him.
Victoria went into deep mourning. Often called “the widow of Windsor,” she wore only black and lived a secluded life at Windsor Castle until her own death at age eighty-one. Today, her name and Albert’s grace London’s great Victoria and Albert Museum, known affectionately as the V&A. London is also home to several major public monuments that were commissioned by Victoria to honor her “dear Albert” and which serve as a reminder that theirs was truly a royal love story.
Marriage of Victoria and Albert Painting by George Hayter It has been said that Queen Victoria started a bridal custom of wearing a white wedding gown. Prior to that time royal brides wore elaborate dresses made especially for the occasion from gold or silver fabric sometimes embroidered with silken threads and embellished with semi-precious stones to show their wealthy status. Ordinary brides of the working class wore their “best dress” usually made in a dark and durable material.
Prince Albert and Queen Victoria with five of their children. The Prince Consort (26 August 1819 – 14 December 1861), lived long enough to see only one of his children married and two of his grandchildren born , while Queen Victoria (24 May 1819 – 22 January 1901) lived long enough to see not only all her grandchildren, but many of her 87 great-grandchildren as well.
Queen Victoria and Charles Dickens were acquaintances and she was a huge fan of his books. You can read more about the Victorian age in Andrea Warren's book Charles Dickens and the Street Children of London. For more information, visit her website.
Andrea Warren is a member of iNK's Authors on Call and is available for classroom programs through Field Trip Zoom, a terrific technology that requires only a computer, wifi, and a webcam. Click here to find out more.
I really like vultures. Sure, they’re ugly and they eat nasty dead things. But those are not necessarily bad characteristics.
First let’s deal with “ugly.” Vultures’ bald heads are what make them seem ugly to most people. But think about why they’re bald. Imagine thrusting your head inside the carcass of a white-tailed deer to reach the meat. A feathered head might capture bits of flesh, blood and gore and you end up with a face full bacteria and flies. Scientists believe that one reason vultures have evolved featherless heads is to aid in hygiene. A bald head stays clean and any remaining germs or bacteria are baked off by the sun. Vultures have also found that a bald head can help with temperature regulation. When it gets cold they can tuck their heads down to keep their neck covered with feathers. When it’s hot, vultures can extend their neck to expose bare skin. Their bald heads work so well that I wrote a poem about them.
It’s best to have no feathers,
When you stick your head in guts,
That way you don’t go walkin’ round,
Your noggin dripping schmutz.
Moving on to “eating nasty dead things,” the next time you see vultures eating a dead animal on the side of the road, be thankful! That carcass might be dead from rabies or contaminated with other harmful diseases. Vultures have the amazing ability to consume rotting and diseased flesh and stay healthy. It’s all in the stomach. Vultures possess very powerful stomach acids that destroy most bacteria and deadly viruses. In fact, vulture stomach acid is so strong it can dissolve metal! Except if that metal is lead shot -- many turkey vultures are killed every year by consuming shot that they encounter in dead deer. Vultures are the world’s natural “sanitation workers,” helping to stop the spread of disease.
I’m so appreciative of the work they do, I even wrote a poem about eating dead things:
I like my meat dead,
It’s best if it’s not moving.
Don’t want to see one final twitch,
I prefer it oozing
So, the next time you see a vulture circling in the noonday sky, think about the valuable and important clean up service this bird provides to us and to the environment. Maybe I’ll write a poem about that….
Steve Swinburne is a science writer, but as you can see from this Minute, he likes to write poetry too. In his book Ocean Soup, he offers verses in the voices of tide-pool animals, including the barnacle, sea urchin, sculpin, mussel, starfish, hermit crab, anemone, and lobster. For more about Steve's poetry, click here.
Steve Swinburne is a member of iNK's Authors on Call and is available for classroom programs through FieldTripZoom, a terrific technology that requires only a computer, wifi, and a webcam. Click here to find out more.
When Julius Caesar took control of the Roman government, he decided to reform the calendar. Because it was a lunar calendar—based on complete cycles of the moon—it had fluctuated widely for centuries. Some years had as few as 355 days while others nudged 380, often seemingly by whim. After lengthy consultations with the Egyptian astronomer Sosigenes, Caesar established a calendar that is virtually the same one we use today. The lengths of the months alternated between 30
and 31 days, except February which had 29. The new calendar came into effect on January 1, 45 BCE (Before the Common Era). A grateful Roman Senate immediately changed the name of the month of Quintilis—Julius Caesar’s birth month—to July in his honor. As is the case today, it had 31 days. Caesar had only one year to enjoy “his” month, as he was assassinated the following March.
His successor was his grand-nephew Octavian, who took the name of Augustus Caesar when he officially became the first Roman emperor. In 8 BCE the Senate decided that he also deserved a month. Because several noteworthy events during Augustus’s reign had occurred in Sextilis, the month following July, they chose it. Big problem. Sextillis had only 30 days. No way would the Senate allow Augustus to be “inferior” to his great-uncle in any way. So it took a day from February and tacked it on at the end of August. That created another problem. Three consecutive months—July, August, and September—were now 31 days long. The fix was simple: the Senate simply flipped the lengths of the remaining four months. September and November went from 31 days to 30, while October and December bulked up to 31.
The Senate wasn’t finished with its tinkering. Nearly 70 years later, it honored the notorious emperor Nero by changing Aprilis to Neronius. The new name never gained traction. Nero. who had murdered his brother, mother, and wife, committed suicide in 68 CE (Common Era). The Senate—undoubtedly relieved at his demise—hastily returned Neronius to its original name.
Jim Whiting has written on many subjects. Check out his page on Amazon.com
Here are some Minutes that preview the coming school year.