Similar to the Catholic rosary, a prayer rope is a loop of complex knots used by Eastern Orthodox Christians and Eastern Catholics to track the number of times they have recited a certain prayer, generally one known as the Jesus Prayer. In some churches, reciting the Jesus Prayer a specific number of times can, when necessary, replace certain worship services. For example, instead of reading the entire Psalter, a worshipper might recite the short prayer how many thousands of times?
Back in the day
In physics, the theory of special relativity generalizes Galileo's principle of relativity—that all uniform motion is relative and that there is no absolute state of rest. Though physicists Hendrik Lorentz and Henri Poincaré had made contributions to the theory already, Einstein provided a radically new interpretation in his 1905 paper "On the Electrodynamics of Moving Bodies." In it, Einstein redefines the concepts of space and time and abolishes the concept of "aether," which is what?
Born on a day like today
An iconic American singer and actress, Horne began dancing at Harlem's Cotton Club as a teen and, with the help of her stunning voice and good looks, was soon singing with popular bands. She went on to record and perform extensively and appeared in a number of musicals and films, including Stormy Weather, whose title song became her signature. Her one-woman show, Lena Horne: The Lady and Her Music, was hailed as her masterpiece. Why was Horne blacklisted in the 1950s?