John Noble Wilford, a "New York Times" science writer, outlines various hypotheses on the origin of bipedalism.

Around 50 million years ago, the mammalian ancestor of today's whales returned to the ocean. In this genomics science fair project, you will use mitochondrial protein sequencing to trace the evolution of whales and identify their closest...

Students create four-legged walking robots and measure how far they travel across different types of surfaces. They design and create "shoes" to add to the robots' feet and observe the effect of their modifications on the net distance...

The simplest kind of table was a round one with three legs. It is shown in the drinking scene painted on the wall of a wine shop at Pompeii, and is represented in the annexed woodcut. Tables, however, must usually have had four legs. For...

The palaeontological site of Miguasha National Park, in south-eastern Quebec on the southern coast of the Gaspe peninsula, is considered to be the world's most outstanding illustration of the Devonian Period known as the 'Age of Fishes'....

This drawing shows the possible appearance of Anchiceratops, a dinosaur from the late Cretaceous Period (around 70 million years ago). Anchiceratops was a herbivore (plant eater) that walked on four legs and featured three horns on its...

[Free Registration/Login may be required to access all resource tools.] Centipedes and millipedes belong to the subphylum Myriapoda, which contains 13,000 species. They all live on land. They are divided among four classes: (1) Chilopoda...

Our eyes are practically magical, but they cannot see everything. For instance, the naked eye cannot see the moment where all four of a horse's legs are in the air or the gradual life cycle of plants- but cameras can capture these...

The aardvark looks a bit like a pig. Its body is stout, with an arched back, and is sparsely covered with coarse hairs. Its legs are medium length. Its front feet have four toes, while the back feet have five toes. Each toe has a large,...

The mythological creature, dragon.

From ABC News in Science, Will Dunham's article on orangutans covers topics related to the evolutionary process of "bipedal walking," or walking on two legs instead of four.

A webpage on optical illusions, containing a grid of black squares, an elephant with four or five legs, and a picture with three faces in it.

The largest of scorpions, but not the longest, the emperor scorpion (Pandinus imperator) has a dark body ranging from dark blue/green through brown to black. The large pincers are blackish-red and have a granular texture. The front part...

This marvelous bed, which belonged to Queen Hetepheres, rests on four gilded wooden supports in the form of lion's legs. Her son, King Khufu, transferred her funerary bed from Dahshur to Giza to provide more security.

The latticed stool, among the most commonly used of the time, belonged to the artisan Sennedjem. Thin struts of wood with angled braces supporting the seat and four rounded, animal-shaped legs support the chair.

This diagram shows four different grips used by a seam bowler in the sport of cricket. The different deliveries include a fast ball, slower ball, off cutter and leg cutter, all achieved by holding the cricket ball with slightly different...