Little progress had been made in solving Ramsey problems since the 1930s. Now, researchers have found the answer to r(4,t), a longstanding Ramsey problem that has perplexed the math world for decades.

For all the true crime sleuths who love the chilling mystery of a cold case, feel free to take a dive with us into The Root’s bank of crimes that went unsolved or took too long to solve. To this day, ...