Your body has about 30 trillion cells & even more of these single-celled organisms that may cause disease

(Sarah of the Clue Crew demonstrates.) Thanks to a phenomenon known as total internal reflection you can trap a laser beam inside a stream of water the same principle that enables this type of cable to carry your internet or TV signal

The deep-dwelling colossal this has the largest eye of any animal 11 inches in diameter

(Kelly of the Clue Crew demonstrates.) Stretch a coil of nitinol then put it in hot water & it returns to its original form; made of nickel & titanium it's a shape memory one of these metallic mixtures

When it's near the temperature & pressure known as this point water will boil & freeze at the same time

During liftoff these reusable spacecraft like the Atlantis reach speeds over 3000 MPH

In 1983 a record low temperature -128.6 degrees F. was recorded at Vostok on this icy continent

This large bird can grow up to 8 feet tall weigh 345 pounds & have eyeballs 2 inches in diameter

This country that has Helsinki as its capital has almost one cell phone for every 2 people

The Goliath bird-eating variety of this arachnid can grow up to 11 inches across

Shock treatment for epilepsy was once administered using this freshwater fish Malapterus electricus

Seen here the temple of this goddess was moved brick-by-brick to save it from rising waters

It was the first national capital city occupied by U.S. troops