Purchasing Wolfram Mathematica is not required to open the notebook! It can be viewed and interacted with using the freely available Wolfram Player. The notebook's interface is quite straightforward.

Abstract: The stratosphere is the highest layer of Earth's atmosphere where aircraft can still fly. Today, the potential of stratospheric vehicles is largely unexploited, but in the future, they will ...

"I see so much of my job as not just telling you a story but taking you somewhere," says the bestselling author of "Daisy ...