The Cambrian Explosion 1) Many of the major phyla of animals arose during the Cambrian period,
Questions: 4 | Duration: 0 Min.

Tiger Moths One of the most beautiful of the 100,000 known species in the order Lepidoptera are
Questions: 4 | Duration: 0 Min.

Dissociative Identity Disorder 1) Dissociative identity disorder is a psychological condition i
Questions: 5 | Duration: 0 Min.

Wrigley’s Chewing Gum 1) Wrigley’s chewing gum was actually developed as a premium
Questions: 5 | Duration: 0 Min.

Limestone Caves 1) Limestone caves can be spectacular structures filled with giant stalactites
Questions: 5 | Duration: 0 Min.

Flatfish Members of the flatfish family, sand dabs and flounders, have an evolutionary advantag
Questions: 5 | Duration: 0 Min.

Brown Dwarfs 1) A brown dwarf is a celestial body that has never quite become a star. A typical
Questions: 7 | Duration: 0 Min.

The Clovis Culture 1) Archeologists have found sites all over North America that contain simila
Questions: 5 | Duration: 0 Min.

The Postage Stamp 1) The postage stamp has been around for only a relatively short period of ti
Questions: 5 | Duration: 0 Min.

Lake Baikal 1) Crescent-shaped Lake Baikal, in Siberia, is only the ninth largest lake in area
Questions: 5 | Duration: 0 Min.

Uranium 1) Uranium, a radioactive metal named after the planet Uranus, is a primary source of e
Questions: 2 | Duration: 0 Min.

Popsicle 1) A number of products that we commonly use today were developed quite by accident. T
Questions: 2 | Duration: 0 Min.