Find out why Galileo's beliefs in a heliocentric solar system threatened the Catholic Church and caused him to stand trial for heresy.

The race to construct the first underwater telegraph intensifies after pressure to connect the U.S. to other countries increases.

Nuclear submarines are priceless military assets, owned and operated by only a handful of countries. Find out what it takes to operate one.

The first radio signals beamed across America In the early 20th century. See how this cultural revolution began.