Tesla's Death Ray

Before his death, Nikola Tesla was reportedly working on what the press called a "Death Ray." It was a weapon so powerful it could obliterate military targets from hundreds of miles away, but did it actually exist?

1:35m watch

Related Videos

Inventions & Science

The Hollywood Actress Who Invented Wi-Fi

Hedy Lamarr, Hollywood actress, is known for more than her acting—she invented a signal-hopping technology used in Wi-Fi.

Inventions & Science

The Birth of the Internet

On October 29, 1969, Stanford programmer Bill Duvall sent a single-word message—"login"—to UCLA student programmer Charley Kline, 350 miles away. Transmitted between two computers that each filled an entire room, this message marked the first communication between networked computers and is widely regarded as the birth of the internet.

Inventions & Science

Grace Hopper Pioneers Computer Programming

Grace Hopper, pioneer of computer science, lived in Virginia later in life and is buried at Arlington National Cemetery.

Inventions & Science

10 Military Inventions We Use Every Day

Many everyday tools—from zippers to Super Glue to computers—originated as military inventions.