Geography
Why Do Earthquakes and Volcanoes Happen? Plate Tectonics
Earthquakes and volcanoes happen mostly where tectonic plates meet. Earth's rigid outer shell is broken into plates that move a few c...
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Physics
How Do Rockets Work in Space With No Air? Newton's Third Law
A rocket doesn't push on air or on the ground. It pushes on its own exhaust gas. The engines throw hot gas out of the bottom, and by ...
Explains
How Does GPS Work Without Internet? It's All About Time
Yes, GPS works without internet. Your phone only listens to the atomic clocks on the GPS satellites overhead, 20,200 km up. Each signal s...
Code
Decimal to Binary in JavaScript: toString(2) and a Loop
To convert a decimal number to binary in JavaScript, call toString(2) on it: (13).toString(2) gives "1101" . By hand, and in y...
Code
Binary to decimal in JavaScript and Python, with code
To convert binary to decimal in JavaScript, call parseInt(s, 2) : parseInt("1101", 2) gives 13. In Python it's int("11...