Discover how astrophysicists map the universe. Focus on the tricky problem of calculating distances, seeing how a collection of overlapping techniques provide a "cosmic distance ladder" that works from nearby planets (by means of radar) to stars and galaxies (using parallax and Cepheid variable stars) to far distant galaxies (by observing a type of supernova with a standard intrinsic brightness).

Unlike the well-founded theories you've studied so far in this series, turn to one that is as-yet-unproven -- but mindboggling in its implications. Cosmic inflation proposes that a period of explosive expansion occurred in the first instants of the Big Bang. This startling idea accounts for two puzzling features of today's universe: the observed uniformity of matter and the flat geometry of space.

If you have a clever anecdote, an interesting memory, a new way to explain how something works, or an opinion on a social or political issue, then you have an essay in you. Unlike a novel, history book, or scientific publication, essays provide you with the versatility to express all the various facets that make you you. The concise and direct nature of an essay means that you may tap into your sense of wit, share your individual point of view, persuade...

Taught by noted physicist Dr. Don Lincoln of the Fermi National Accelerator Laboratory, this course follows the search for a theory that explains all physical reality-a theory of everything. Dr. Lincoln covers recent developments in particle physics and cosmology, plus the background needed to appreciate the centuries-long search for this holy grail of science. Only high-school-level math is used.

The Bon Appétit Test Kitchen is on a quest for perfection, from the perfect pizza to what makes the perfect Thanksgiving meal.

After Solomon's reign, grasp how the kingdom of Israel divided into a Northern Kingdom and the Southern Kingdom of Judah. Observe how the Northern Kingdom became dominant under the powerful King Omri, creator of the capital of Samaria, excavated in the early 20th century. Learn of the divisive rule and tragic fate of Omri's son, Ahab, and how the kingdom fell to aggression by the Assyrian Empire.

A TV show about the Middle Ptolemies might be called "Lifestyles of the Rich and Murderous." With few exceptions, the members of this dysfunctional dynasty were violent, debauched, and generally neglectful of the country they ruled. The Egyptians hated them and frequently rebelled, forcing some to flee for their lives. With each Ptolemy, Egypt sank deeper, making a return to greatness impossible.

Positive Psychology is a relatively new branch of psychology as introduced in 1998 by Professor Martin Seligman, but it has quickly developed a large following amongst practitioners around the globe. It concentrates on studying and promoting positive human functioning, and developing effective interventions that help to support thriving individuals, families, and communities. Positive psychology aims to go beyond just treating mental illness, and...

Jump-start your creativity with a selection of fun exercises, including “What-If Moments” and “The First-Line Game.” Mr. Bell cites best-selling authors such as Alice Sebold and Mickey Spillane to demonstrate the importance of creating unique elements: a twist, a character, a setting, a relationship. Find out how to create the ever-important elevator pitch.

Jack's house is like no other and its inhabitants are full of fun and surprises. There is even a special guest star at the end of this humorous and unique interpretation of an age-old classic.