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How to write equations from word problems in 4 steps
To write an equation from a word problem, use four steps. Name the unknown with a letter and its units ("let d be the distance in mil...
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Maths
How to write equations from word problems in 4 steps
To write an equation from a word problem, use four steps. Name the unknown with a letter and its units ("let d be the distance in mil...
Builds
ESP32 LED blink: code, circuit and the resistor you need
To blink an LED with an ESP32, run a wire from GPIO 23 to a 220 Ω resistor, the resistor to the LED's long leg, and the LED's shor...
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...
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...