Billions of years ago, shortly after the Big Bang, the universe was a dark place full of cold hydrogen gas. One of the mysteries of astronomy is what happened to change that, to warm and “reionize” the hydrogen and turn the universe once again transparent to light, blazing with stars and galaxies.... Read More إقرأ المزيد | Share it now!

In this video, I show how the level 5-5 is passed on the App called Doors and Rooms. Enjoy!... Read More إقرأ المزيد | Share it now!