Entire cities decimated. Twenty million dead. The origin of quarantine. The crew investigates how the plague swept across Europe during the Middle Ages.

What is space-time bending? How does it connect to gravity? Felipe takes a closer look at the science behind time travel.

As Felipe visits the Shy Wolf Sanctuary, he examines how — thousands of years ago — certain wolves evolved into dogs and became closer to humans.

Felipe talks about flesh-eating creatures that are stranger than fiction, while the impressionable Betinho frets about an experiment at Dr. Tay's lab.

Could humans be wiped out from the planet like the dinosaurs? Is life on Earth facing another mass extinction? The lab crew investigates.

Super-intelligent computers are not too far away, but will society be able to keep up with these advances? Could AI — like Briggs — turn against us?

Earth has faced changes in climate before, so is global warming as alarming as people think? The team tries to educate a special guest on the issue.