After years of research, the scientist finally found what he considered the Holy Grail of renewable energy: a cheap, efficient battery.

During the 13th century, the Holy Roman Empire struggled to maintain unity among its diverse principalities.

Historians often debate the political motivations that drove the Holy Roman Emperors to ally with various Italian city-states.

As a historian, she often lectures on the political reforms enacted by the Holy Roman Emperor during the 12th century.

The new documentary explores the rise of holy unblack metal in the underground scene.

holy crap on a stick! The fireworks were bigger than anything I've ever seen.

After the sermon, the priest moved through the pews administering holy-water sprinkles to each family.

During the blessing, the priest carefully waved the holy-water sprinkle over the congregation.

After years of study and spiritual discernment, she decided to take holy orders and serve her community as a priest.

Because All Saints' is a holy day of obligation, many families attend Mass together in the morning.