The "4% rule" has guided retirement for decades. Now its inventor says it's outdated-and the new 4.7% rule could reshape how ...

In cellular automata, simple rules create elaborate structures. Now researchers can start with the structures and ...

Mila Koumpilova, Chalkbeat, and Jennifer Smith Richards, ProPublica ProPublica is a nonprofit newsroom that investigates ...

Research on statistical arbitrage in U.S. equities (1997–2007) shows that PCA-based strategies achieved average annual Sharpe ...