Code
How do computers add numbers? Binary and logic gates
Computers add numbers in binary, with circuits built from logic gates. Every binary digit is a switch that is on (1) or off (0). An XOR ga...
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Code
Bubble sort and insertion sort in Python, step by step
Bubble sort walks along a list comparing neighbours and swapping any pair that's out of order, and each pass carries the biggest remai...
Geography
How Are Earthquakes Measured? Why M8 Isn't Twice M4
Earthquakes are measured with seismometers, instruments that record the ground shaking as a wiggly line called a seismogram. From those re...
Biology
Why are cells so small? Surface area to volume ratio
Cells are small because everything a cell needs, such as oxygen and glucose, has to get in through its surface, and much of it then spread...