Czech Hedgehog

We just learned about the Dragon's Teeth used to stop tanks.

Another type of fortification is a Czech Hedgehog.

These were iron bars that were welded together in criss cross patterns and then put out on the ground to stop tanks.
The tanks couldn't drive over them, and they were too heavy to push around.
They also could not be knocked over, because even if they were tipped over they would still make the same kind of X star shape that tanks couldn't drive over.

They were called Czech Hedgehogs because they are spikey like a hedgehog, and they were first used in Czechoslovakia to protect them from German tanks during World War II.


(from: wikipedia - czech hedgehog)


Kid Facts - Blast from the past: Predjama Castle

Leo and Attila

We just learned about the Saint Patrick who told people in Ireland about Jesus.

Another part of ancient Christianity was the meeting between Leo and Attila .

Leo was a leader called a Bishop of the church in Rome, Italy.
Rome was usually thought of as the most important city of all, so the Bishop in Rome was usually the most important Bishop and got called the "Pope".

Attila the Hun was a warrior who was attacking all over the place, and in 452 AD came to Italy to try and take over.
The Emperor of Rome sent Pope Leo and a few other people to meet Attila and try to see if they could talk to him and make him not come attack Rome.

No one knows really what was said, but after meeting with Pope Leo, Attila packed up his troops and left Italy.

A person who goes and meets with other leaders of countries is called an "Ambassador" and Pope Leo was thought to be a very good ambassador because he helped save Rome from Attila the Hun.


(from: wikipedia - pope leo i)


Kid Facts - Blast from the past: Epaphroditus - Bishop of Andriace

Toltec Atlantean figures from Tula

We just learned about the Montezuma's Headdress.

Another famous Mesoamerican ancient sculpture is the Toltec Atlantean figures from Tula.

These are four big statues that used to be pillars that held up a roof for a building.
They are called atlantean figures, because they look kind of like sculptures of Atlas holding up the world that were found in Europe long ago.

The sculptures are in the town of Tula in the state of Hidalgo in Mexico.
No one knows for sure when they were built, but people think it was around 750 AD, by the Toltec people who lived there.

The statues are over 15 feet tall, have butterfly shaped armor, sun shields, feathered helmets, and spears.
They were warriors that were meant to serve the mythical Quetzalcoatl from ancient times in Mexico.


(from: wikipedia - atlantean figures)


Kid Facts - Blast from the past: Asura at Kōfuku-ji temple

Russian - Good Morning

We just learned a few ways to say hello and goodbye in Russian, like Привет (privet), Здравствуй (Zdravstvuy), Пока (poka) and до свидания (do svidaniya).

Sometimes you might want to say good morning, good afternoon, or good night.

Good Morning - Доброе утро (Dobroye utro) - sounds like doh-b-day oo-t-doh

Good Day - Добрый день (Dobryy den) - sounds like doh-b-day den

Good Evening - Добрый вечер (Dobryy vecher) - sounds like doh-b-day vee-chay-der

Good Night - Доброй ночи (Dobroy nochi) - sounds like doh-b-day noh-chee



(from: wikipedia - russian academy of sciences)

Norwegian: God morgen, God dag, God ettermiddag, God kveld, God natt

Greek: Καλημέρα (Kaliméra), Καλησπέρα (Kalispéra), Καληνυχτα (Kalinychta)

ASL: Good Morning, Good Day, Good Evening, Good Night

Italian: buongiorno, buon pomeriggio, buonasera, buona notte

German: Guten Morgen, Guten Tag, Guten Abend, Gute Nacht

Spanish: Buenos días, buenos tardes, buenas noches

French: bonjour, bonsoir, bonne nuit

Cam

We just learned about the linear actuator.

Another type of actuator or moving machine is a Cam.

A cam is a disc usually on a rotor that is spinning around.
The disc is mostly shaped like a circle, but it as a part that sticks out like a bump.
The circle disc is called the camp plate, disc cam or radial cam.

When the rotor spins around, that bump part of the cam can push down on something like a shaft or a pole.
Machines can use this to push those shafts down over and over again.
So every time the rotor spins around, it pushes the shaft down and then back up.


(from: wikipedia - cam)


Kid Facts - Blast from the past: Lagari Hasan Çelebi

Tentacles

We just learned about the Oral Arms of a jellyfish.

Another part of a jellyfish is the Tentacles.

These are the arms that hang down from the edge of the big circular bell of the jellyfish.
The tentacles have stingers on them that help them catch prey, and then the oral arms help bring them up to their manubrium mouth.


(from: wikipedia - jellyfish)


Kid Facts - Blast from the past: Cephalopod Ink

Fibrous Tunic

We just learned about the Aqueous Humour.

Another part of the eye is the Fibrous Tunic.

We learned before about the clear cornea bubble at the front of the eye, and the white sclera that makes the outside white part of the eye.

These two parts together are called the fibrous tunic.
The word tunic is an old word for clothing that people wore long ago.

Sometimes the words cornea and sclera are smushed together and just called the corneosclera.


(from: wikipedia - fibrous tunic of eyeball)


Kid Facts - Blast from the past: Odontoblast