Richard Trethewey replaces a three-handle shower valve with a single-handle anti-scald valve. (See below for a shopping list and tools.) SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisOldH...

Roger Cook demonstrates how to cut and shape stones for hardscaping projects. (See below for a shopping list, tools, and steps.) SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisOldHouse...

This Old House landscape contractor Roger Cook helps a homeowner maintain an overgrown perennial garden. (See below for a shopping list, tools, and steps.) SUBSCRIBE to This Old House: http://bit.l...

This Old House landscape contractor Roger Cook and host Kevin O Connor patch a lawn with grass seed. SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisOldHouse Shopping List for Patching...

Richard Trethewey shows how to rough-in the drainpipes for a basement bathroom. (See below for steps.) SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisOldHouse Richard used standard...

This Old House plumbing and heating expert Richard Trethewey and host Kevin O Connor install a ductless heat pump to heat and cool a room. SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisO...

In this episode of Crash Course Psychology, Hank takes a look at WAIS and WISC intelligence tests and how bias can really skew both results and the usefulness of those results. Want more...

In which John Green teaches you about disease and the effects that disease has had in human history. Disease has been with man since the beginning, and it has shaped the way humans operate...

约翰格林教给你关于战争的教训！具体来说，约翰谈论人类是否天生喜欢战争，是否被强行杀死，或者战争是一种文化建构。约翰将谈论霍布斯与卢...

In which John Green investigates war, and what exactly it may or may not be good for. Was war a result of human beings organizing into larger and more complex agricultural social orders, or...

In this episode of Crash Course Psychology, Hank takes a look at how the treatment for psychological disorders has changed over the last hundred years and who is responsible for getting us...

In which Stan Muller subs for John Green and teaches you about energy and humanity. Today we discuss the ideas put forth by Alfred Crosby in his book, Children of the Sun. Historically, almost...

In this episode of Crash Course Psychology, Hank has trouble saying the words and posits a world in which he can be hypnotized to forget things just so he can enjoy them all over again. --...

In which John Green teaches you a little bit about drought, which is a natural weather phenomenon, and famine, which is almost always the result of human activity. Throughout human history,...

In which John Green, Hank Green, and Emily Graslie teach you about what happened in the Universe after the big bang. They ll teach you about cosmic background radiation, how a bunch of hydrogen...

In which John Green teaches you about the Bronze Age civilization in what we today call the middle east, and how the vast, interconnected civilization that encompassed Egypt, The Levant, and...

In which Hank and John Green teach you about life on Earth. They won t be giving advice on how life should be lived, because this is a history series. Instead, they ll teach you about the earliest...

In which John Green talks about the methods of writing history by looking at some of the ways that history has been written about the rise of the West. But first, he has to tell you what the...

Plumbing and heating expert Richard Trethewey shows how to pour a massive concrete storm shelter. (See below for steps.) SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisOldHouse Steps...

So, you know you d like to get help with some problematic behavior (like fear of flying). What do you do? Who can you go to for help? Once you ve gone, what can you expect? In this episode...