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The San Francisco Earthquake is a thorough examination of the April 18, 1906, earthquake that is considered one of the first environmental disasters of the modern age. Striking California's Bay Area, the quake and its resulting fires destroyed a rapidly growing, prosperous city and left more than 500 people dead, thousands homeless, and $500 million worth of property damage.

In 2008, Professor Lee Berger--with the help of his curious 9-year-old son--discovered two remarkably well preserved, two-million-year-old fossils of an adult female and young male, known as Australopithecus sediba; a previously unknown species of ape-like creatures that may have been a direct ancestor of modern humans. This discovery of has been hailed as one of the most important archaeological discoveries in history. The fossils reveal what may be one of humankind's oldest ancestors.

After more than a century of peaceful dormancy, the volcano Nevado del Ruiz in Columbia, South America, erupted. Blistering clouds of searing volcanic gases and ash flash-melted huge amounts of snow, launching a towering wall of hot mud toward the village of Armero. People ran - but they couldn't outrun the onslaught, and 23,000 perished.

They have a touch so feather-light, it can barely be felt on human skin. The vividly gold and black colored golden orb weaver spider is the largest web-making spider on the planet. These elegant and efficient arachnids can weave impressive webs up to three feet wide in less than an hour. And these spiders' silk-spinning abilities could have far-reaching implications for science and medicine.