What Am I? — Five Clues
Famous Last Mistakes
Strange Things in Space
Actors Before They Were Famous
Geography Without a Map
100
  • I was introduced commercially in the 1980s.
  • I depend on satellites.
  • I require extremely accurate clocks.
  • Originally developed for military use, I became available for widespread civilian navigation.
  • Your phone probably uses me every day.

GPS (Global Positioning System)

100

Engineers warned that unusually cold temperatures could compromise rubber O-ring seals, but the launch proceeded on January 28, 1986.

Space Shuttle Challenger disaster

100

This planet has a gigantic storm called the Great Red Spot that has persisted for centuries and is larger than Earth in diameter historically, though it has been shrinking.

Jupiter

100

Before becoming an action superstar, this actor played Mr. Freeze on Batman & Robin, but much earlier appeared as Hercules in the 1970 film Hercules in New York.

Arnold Schwarzenegger

100

I am the only country that borders both Spain and France, and I'm one of Europe's smallest sovereign states.

Andorra

200
  • I was discovered by soldiers in 1799.
  • I contain essentially the same decree written in three scripts.
  • One of those scripts is ancient Greek.
  • I helped scholars decipher Egyptian hieroglyphics.
  • I'm named for the Egyptian town near where I was found.

Rosetta Stone

200

The crew ignored multiple iceberg warnings while maintaining high speed across the North Atlantic. The ship struck an iceberg shortly before midnight on April 14, 1912.

sinking of the Titanic

200

This moon of Saturn has lakes, rivers, clouds, and rain—but instead of liquid water, its surface lakes are primarily methane and ethane.

Titan

200

Before becoming one of Hollywood's biggest stars, this actor was killed by Freddy Krueger in his film debut, A Nightmare on Elm Street, and later starred on 21 Jump Street.

Johnny Depp

200

I am a U.S. state bordered by exactly one other U.S. state, but I share an international border with Canada and have thousands of miles of coastline.

Maine

300
  • I was predicted theoretically before I was directly detected.
  • Albert Einstein's theory is fundamental to understanding me.
  • I travel at the speed of light.
  • Scientists first directly detected me in 2015 using two enormous interferometers.
  • Colliding black holes can produce me.

gravitational waves

300

Operators conducting a late-night safety test disabled or bypassed several safety systems and placed an unstable reactor into conditions that culminated in explosions on April 26, 1986.

Chernobyl disaster

300

This type of stellar remnant can pack more mass than the Sun into a sphere roughly the size of a city, with matter so dense that a teaspoonful would weigh around a billion tons on Earth.

neutron star

300

Before Jurassic Park and Pulp Fiction, this actor had small roles in films including Coming to America and played a criminal who attempts to rob a restaurant in the movie's famous hold-up scene.

Samuel L. Jackson

300

I am a landlocked South American country bordered by Brazil, Argentina, and Bolivia, and my capital sits on the Paraguay River.

Paraguay

400
  • I was accidentally discovered in 1965.
  • Two radio astronomers initially blamed some of my signal on pigeon droppings.
  • I arrive from essentially every direction in space.
  • Today my temperature is approximately 2.7 kelvin.
  • I'm electromagnetic radiation left over from the early universe.

cosmic microwave background

400

In 1981, suspended walkways in a Kansas City hotel collapsed during a crowded dance after a design change effectively doubled the load on a critical connection.

Hyatt Regency walkway collapse

400

These extraordinarily magnetic neutron stars can possess magnetic fields trillions of times stronger than Earth's, and occasionally produce enormous bursts of X-rays and gamma rays.

magnetar

400

Long before Breaking Bad, this actor appeared as Dr. Tim Whatley, Jerry's dentist, on Seinfeld and played astronaut Buzz Aldrin in the HBO miniseries From the Earth to the Moon.

Bryan Cranston

400

I am an African country completely surrounded by South Africa, making me one of only three sovereign countries in the world entirely enclosed by another country.

Lesotho

500
  • I was discovered in an ancient shipwreck in 1901.
  • I contain dozens of interlocking bronze gears.
  • I was constructed more than 2,000 years ago.
  • I could model astronomical cycles and predict eclipses.
  • I'm sometimes described as the world's oldest known analog computer

Antikythera mechanism

500

In 1940, aerodynamic forces caused this newly opened suspension bridge to twist violently before a large section of its roadway collapsed into Puget Sound just months after opening.

Tacoma Narrows Bridge collapse? (“Galloping Gertie”)

500

Discovered in 2017, this elongated interstellar object became the first confirmed object observed passing through our Solar System from interstellar space. Its Hawaiian name roughly means “scout” or “first distant messenger.”

Oumuamua

500

Before The Lord of the Rings made him internationally famous, this actor appeared in Witness, Young Guns II, and Carlito's Way, and played Master Chief John Urgayle in G.I. Jane.

Viggo Mortensen

500

I am a country with coastlines on both the Atlantic and Indian Oceans. The Tropic of Capricorn crosses me, and I border both Mozambique and Namibia.

South Africa

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