What You Didn’t Know About Stars, Sinkholes, and Strong Bones

Have You Heard of the 'Desert Breath'?
If you look from above, you might see a strange spiral in the Eastern Sahara Desert in Africa. It’s not a natural formation or an old ruin, it’s actually a piece of art! Called Desert Breath, it was created in 1997 by a group of artists known as D.A.S.T Arteam. This special artwork spreads out across 22 acres of desert.

Do You Know Which Foods Strengthen Bones?
We all know that calcium is important for bones, but did you know vitamin D is just as important? You can get it from milk, yogurt, fish like tuna, sardines, and salmon, and also from tahini, spinach, and leafy green vegetables. The best source of vitamin D, though, is a little time in the sun.

Ever Wonder Why Lighthouses Used to Shine Different Colors?
In the past, lighthouses didn’t all shine the same color. Each one had a different light color to help sailors know where they were. The lights helped guide ships safely to shore and even told them which coast they were near. Today, thanks to modern technology like GPS, lighthouses aren’t used as much anymore.

Which Starfish Preys on Coral?
It’s called the crown-of-thorns starfish or the coral starfish. This sea creature has about 20 arms and a mouth right in the center. To eat coral, it actually pushes out its stomach and releases special juices that help it digest the coral. It hunts mostly at night and can finish off a whole coral in just one night!

How Do Sinkholes Form?
Sinkholes usually happen when water underground washes away the rock or salt below the surface, leaving a hollow space. Eventually, the land on top falls in. Near the Dead Sea, sinkholes are common because the underground water dissolves layers of dry salt, making the ground above collapse.