The math of the Rubik's cube

Last August, 30 years after the Rubik’s cube first appeared, an international team of researchers proved that no matter how scrambled a cube got, it could be solved in no more than 20 moves. Although the researchers ...

Ensuring cash supplies in crisis and emergency situations

The demand for cash increases in times of crisis since many people consider banknotes and coins to be a particularly safe way to keep money. Moreover, cash is the only instrument of payment that is largely independent of ...

Study: Students falling behind in math during pandemic

A disproportionately large number of poor and minority students were not in schools for assessments this fall, complicating efforts to measure the pandemic's effects on some of the most vulnerable students, a not-for-profit ...

New mathematical method provides better way to analyze noise

Humans have 200 million light receptors in their eyes, 10 to 20 million receptors devoted to smell, but only 8,000 dedicated to sound. Yet despite this miniscule number, the auditory system is the fastest of the five senses. ...

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