Also, this is how Earth and the Moon look from Saturn.
The Sahara contains several archaeological sites featuring rock art, from several time periods dating back as far as 12000 years. Some of the finest are found in Tassili n'Ajjer national park in Algeria.
As well as showing animals which used to live in the Sahara back when it was still green, including elephants and giraffes, the rock art also shows scenes from people's daily lives, giving us views of ancient North African culture!
I 💚 the Maghrebi Chinese tea
These are concentric circles. None of these lines cross over each other.
These lines are not wonky.
These two letters are the same colour.
(This may be another illusion which not everyone can see)
There are no orange pixels in this image.
This is not a gif.
This image does not really bulge outwards, and those lines are all perfectly straight
There is no spiral in this image. These are concentric circles.
These four squares are actually identical.
This is Deinococcus radiodurans. These bacteria may be the toughest organisms in the world, surviving dehydration, cold, acid, and vacuum, and withstanding more radiation than probably any other living thing.
Some scientists have considered using them as a way of storing data to survive an apocalypse. In 2003, researchers encoded the song It's A Small World into DNA, engineered it into D. radiodurans, and managed to retrieve it without errors 100 generations later.
That 20000 year cycle, by the way, happens because Earth's axial tilt isn't constant. It actually wobbles back and forth. The technical term for this is precession. If you've ever played with a spinning top, you've probably seen this effect happen.
Being a little bigger than a spinning top, this happens more slowly with Earth. As it does, it alters Earth's seasonal variations, gradually causing a change in the Sahara's climate.
The name of the Sahara comes from an Arabic phrase, aṣ-ṣaḥrāʼ al-kubrá (الصحراء الكبرى) meaning "The Greatest Desert". But it was not always a desert.
The climate of North Africa has a slowly varying cycle, and every 20000 years, the Sahara goes from hot desert to wet grassland and back.
5 or 6 millennia ago, the Sahara was green and full of lakes.
I like plants more than people 🌱 Probably not an actual supervillain. Probably.
Sunbeam City is a Libertarian Socialist solarpunk instance. It is ran democratically by a cooperative of like-minded individuals.