Welcome to The Riddler. Every week, I offer up problems related to the things we hold dear around here: math, logic and probability. There are two types: Riddler Express for those of you who want ...
Scientists have picked apart some 500-year-old calculations from the Inca empire. The team deciphered the maths from a series of 'khipus': elaborate structures of coloured, knotted strings.
The opinions expressed in Inspired Instruction: Videos From the Teaching Channel are strictly those of the author(s) and do not reflect the opinions or endorsement of Editorial Projects in Education, ...
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