A clever coin puzzle challenge where a triangle made from ten coins must be flipped to face the opposite direction—by moving only three coins. This visual brain teaser is great for bets, parties, or ...

Oh My My: In 1974, Ringo Starr Became the First (and Is Still the Only) Ex-Beatle to Achieve These Hot 100 Feats Two college football coaches had heated exchange over tortilla controversy Are speed ...

The Napier Deltic, a triangular diesel engine with 38 pistons, powered British trains and naval vessels with unmatched efficiency and a unique design.