Welcome to Quatr.us Study Guides!

Welcome to Quatr.us Study Guides!2018-09-17T18:24:18+00:00

Quatr.us Study Guides has more than 2500 original articles on everything from Aachen to zygotes. What would you like to learn today?

Where things are?

Africa (with Ancient Egypt)
Europe (with Ancient Greece and Ancient Rome)
West Asia (Mesopotamia, the Persian Empire, and the Islamic Empire)
Central Asia
Southeast Asia
Americas (South America, Native Americans, American history)

When things happened?

Bronze Age
Iron Age
Renaissance and Modern

How things work?

Biology (with the parts of a cell)
Chemistry (including atoms, the elements and reactions)
Geology (with the geological eras, plate tectonics and types of rocks)
Math (numbers, geometry, and proofs)
Physics (with space, weathersimple machines, and the laws of motion)

Didn’t find what you were looking for? Try the search bar at the top, or our Site Index! Or check out our weekly newsletter here:

Quatr.us Study Guides Projects and Articles for mid-September:

The synagogue where Maimonides worked in Cairo, Egypt

The synagogue where Maimonides worked in Cairo, Egypt

YOM KIPPUR: It’s almost time for Yom Kippur! Read about the history of Rosh Hashanah, Yom Kippur, and the history of the Jewish people and the land of Israel. Find out about challah bread, the history of apples, and the history of honey. What is a synagogue? What’s a rabbi? What do people do for Yom Kippur?

A hurricane in Cuba

A hurricane in Cuba

HURRICANES: As Hurricane Florence approaches the Carolinas, read up on what causes hurricaneswhy is there wind? Why does it rain? What makes thunder and lightning? You can also review the different kinds of cloudsnimbus clouds, cumulus clouds, cirrus clouds, stratus clouds – and check out what causes tornadoes. Make your own tornado in a bottle! And why are hurricanes getting worse? That’s global warming, thankyouverymuch.

Be safe, everybody. And be good to your neighbors.

This week in history:

FALL EQUINOX: September 22nd – Days and nights are the same length – this is the first day of fall. Find out more about why the seasons change.

Athenian sailing ship with soldiers

Athenian sailing ship with soldiers

BATTLE OF SALAMIS: September 22nd, 480 BC – The Athenian navy, under its admiral Themistocles, defeats the navy of the Persian king Xerxes in the Second Persian War. More about the Athenian navy here.

Castle at Dourdan, built by Philip Augustus

Castle at Dourdan, built by Philip Augustus

PHILIP AUGUSTUS: September 18th, 1180: When his father Louis VII dies, Philip Augustus becomes king of France. Thanks to the Albigensian Crusade and winning wars against the British, Philip left France much richer than he found it, and much more powerful.

NEPTUNE: September 23, 1846 – A team of European astronomers, using good telescopes, first discovers the planet of Neptune.

Neptune from space: A big blue ball

Neptune from space

SANDRA DAY O’CONNOR: September 21st, 1981 – Sandra Day O’Connor becomes the first woman on the United States Supreme Court.

WHAT TO DO THIS WEEK: Celebrate Yom Kippur  the way Jewish people do: by forgiving anyone you have been holding a grudge against.

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History Gifts  – what to get with your Amazon gift card!


Especially check out the last one: The Silence of the Girls – a new novel giving a voice to the women whose voices we don’t hear in the Iliad, especially Briseis.

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What we’ve been working on:

APPLES: We’ve just rewritten and updated our page on the history of apples, so check it out! They’ve done new DNA studies that give us a much better idea about where apples come from, and how they got domesticated in Central Asia and spread all over the world.

New discoveries this week:

a gray concave rock with red lines across it

The oldest drawing in the world, from Blombos Cave in South Africa, about 73,000 BC

OLDEST DRAWING: They’ve found the world’s oldest drawing, done in red ochre on stone about 73,000 years ago, in Blombos Cave in South Africa. Check it out: they’re saying it’s a #hashtag!

OLDEST BEER: It looks like people were making beer before they were farming – like, first they were gathering wild barley and making beer out of it, but then they were like, this is not enough beer, guys, and they started growing it themselves. Why am I not surprised?

a red figure vase showing a woman sitting and working on a large clay pot. Smaller pots hang from the ceiling over her head

A woman making a large pot, in a pottery workshop (Caputi hydria, by the Leningrad painter. Athens, about 490-470 BC)

WOMAN POTTER: Analysis of the bones of a woman buried in the Bronze Age shows that she was probably a professional potter – based on how her bones are worn out and where she had big muscles. She wasn’t the only one, if so – there’s a red-figure vase that shows another woman potter too.

Seasonal food of the week:

FALL: A hint of frost in the air? Turn to some warm early fall recipes that still use late-summer vegetables like ratatouillecorn fritterseggplant with ground lambzucchini and tomato galetteeggplant moussakascallops primavera, or stuffed zucchini. Still cold? Just go ahead and make some quick, easy hot and sour soup.

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