A shard of smooth bone etched with irregular marks dating back 20,000 years puzzled archaeologists until they noticed something unique – the etchings, lines like tally marks, may have represented ...
ATLANTA — Students gathered around a bright blue number board in Melissa Williams’ kindergarten class at the Westminster School, gazing at the bank of 100 blank squares, organized in rows and columns ...
Corrected: An earlier version of this story misspelled the name of Julie Sarama, a researcher who has developed strategies for building the mathematical skills of preschool students. A pair of New ...
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