Follow the history of the universe from just after the big bang to the far future, when the universe will consist of virtually empty space at maximum entropy. Learn what is well founded and what is less certain about this picture of a universe winding down.

Emergency department doctors should always assume every patient has a life-threatening illness-even though only 10% to 20% actually do. How do doctors manage this healthy paranoia? And how do they prepare themselves and their patients for the worst outcome while planning for the best?

What happens when a hotspot is beneath a continent? The answer is Yellowstone National Park, a wonderland of geysers and hot springs nestled in the gigantic caldera of a supervolcano. Tour the attractions of Yellowstone, and ponder the history and future of the hotspot that fuels it.

Humans are, from an evolutionary perspective, certainly the most unique species on Earth. Start the course by learning how to approach the subject of human behavior. You may be surprised to discover that there are plenty of ways in which we have the same behavioral aspects as other animals: and also behaviors for which there is no precedent in the animal kingdom.

Definitive emergency care requires, first and foremost, a diagnosis. Visit a community emergency department that shares space with an urgent care center, and learn how patients like a 2-year-old with a persistent cough and a 49-year-old with a stuffy nose illustrate the importance of treating the cause-not the symptoms.

Explore the three scenarios that pose the greatest threats in a bioterrorism attack: an airborne agent like anthrax, a smallpox attack, and a release of botulinum toxin in cold drinks. Understand the steps that the CDC takes to protect the public and what you can do as an average citizen.

Explore the tension between semi-autonomous military robots and our need to oversee their safety and control. In looking at military robots such as the Predator unmanned aerial system and the Phalanx weapons system, you'll learn about the unique trade-offs involved in the speed and accuracy of action, and the ability to distinguish friend from foe.

Examine the phenomenon of the mind-body connection to see how you can positively influence your mind in order to improve your body. This area of research is opening the door to new ways of thinking about and approaching various healing techniques. Dr. Bauer shares the latest findings and examples.

Trace the origin of tides to the simple fact that gravity varies from point to point in space. This leads not just to the rise and fall of the ocean, but to the gradual slowing of Earth's rotation, Saturn's spectacular ring system, volcanoes on Jupiter's moon Io, and many other phenomena.

The genesis of tornadoes takes place under complex conditions that are still being deciphered by meteorologists who make detailed measurements from up close. Go inside a supercell thunderstorm to see a tornado being spawned. Then learn tornado safety tips and the precautions that professional storm chasers take.