In the 1860s, the Homestead Act provided free land to settlers. Is there anything like that in 2010? In this episode, Marshall explains why and how it's possible to acquire land and houses for free -- or really cheaply -- in the United States today.

Sunglasses have various special coatings: Some are reflective, while others are scratch-resistant. In this episode, Marshall explains how these different coatings work.

In a previous episode, Marshall explained how 4-stroke, direct-injection engines work; In this one, he takes a look at 2-stroke engines that utilize direct injection technology.

Instant cameras made it possible to see a photograph almost immediately after you'd taken it. But how? In this episode, Marshall explains the chemical processes behind regular and instant photographic film.

Nor'easters are storm systems that frequently occur in the eastern United States during winter. In this episode, Marshall explains where Nor'easters get their name, how they work and why some Nor'easters are more powerful than others.

In this episode, Marshall explains the two technologies that are used to backlight LCD panels.

Jello is tasty, colorful and fun to eat, but what's in it? One of its ingredients, gelatin, comes from animals. Marshall Brain breaks down the chemistry of jello and gelatin in this episode.

In this episode, Marshall Brain launches the first of a series of experiments with social media. Tune in to learn more about the new BrainStuff Twitter and Facebook accounts and Marshall's social media experiments.

When you write a check to purchase goods and services, it passes through the hands of several banks before the process is complete. Marshall explains how checks are processed through intermediary banks in this episode.

Oxygen is a necessary component of the air we breathe; but in its pure form, it can be hazardous to one's health. Marshall Brain explains how breathing pure oxygen harms the human body in this episode.