It takes a lot of fuel to heat our homes, preserve our food, and power our gadgets. And for 40 percent of the world, cheap, plentiful coal gets the job done. But coal also releases pollutants into the air, causing environmental damage...

In this video Paul Andersen describes how reversible reactions achieve equilibrium as reactants are converted to products and products are converted to reactants. A model shows how forward reaction rates and reverse reactions rates...

Famed for enormous black-and-white portraits that are pasted on surfaces ranging from the Louvre to the US-Mexico border wall, multimedia artist JR continues to tackle ambitious projects. In this powerfully moving talk, he shares how he...

What happens to the clothes we don't buy? You might think that last season's coats, trousers and turtlenecks end up being put to use, but most of it (nearly 13 million tons each year in the united States alone) ends up in landfills....

Imagine going about your life knowing that, at any given moment, you and everyone you know could be wiped out without warning at the push of a button. This was the reality for millions of people during the forty-five year period after...

If Yoda goes into cardiac arrest, will you know what to do? Artist and first-aid enthusiast Todd Scott breaks down what you need to know about using an automated external defibrillator, or AeD -- in this galaxy and ones that are far, far...

Tribology: it's a funny-sounding word you might not have heard before, but it could change how you see and interact with the physical world, says mechanical engineer Jennifer Vail. Offering lessons from tribology -- the study of friction...

In this video Paul Andersen explains how the electric field strength is directly related to the amount of charge that generates the field.

A lot of work goes into managing our impact on the environment and its impact on us. That work is the work of environmental engineers. In this episode we’ll explore water quality, air quality, noise pollution, waste management, and more.

As anyone who's seen a mummy knows, ancient Egyptian priests went to a lot of trouble to evade decomposition. But how successful were they? Len Bloch details the mummification process and examines its results thousands of years later.

Why are tattoos permanent? How do you deliver the ink? And how do you remove a tattoo if you no longer want it?

The mirror test is supposed to be a way to figure out when an animal is self-aware, but there might be only one particular animal this test works well on: humans.

In this video Paul Andersen explains how natural disasters (like earthquakes, tsunamis, volcanoes and flooding) have affected and will continue to affect humans on the planet. Many of the natural hazards (like volcanoes and storms) can...

Explore cultural tips and etiquette for visiting people’s homes, especially when it comes to shedding your shoes and wearing guest slippers. Learn more about local practices for house slippers, toilet slippers, and even garden slippers....

In this video, we will look at other malware that can harm your computer system or your network.

In this video, learn about the transition of Cisco's DNA Center to Catalyst Center and the features of this new platform.

In this video, we will look at removing tags or symbols that we do not want to use in our word token development process. We will then lemmatize the word token using the tag map lemmatizer.

In this video, you will learn to add word tokens using the normalize function and develop the word token. We are going to use the NLTK.word_tokenize function.

Understand the structure of Linux commands, unlocking the ability to construct commands with confidence and precision.

Clean up your Linux system by safely removing unused or orphan packages, optimizing system resources.

In this video, you will learn how to remove all stored values from the session.

In this video, you will learn how to update quantity in the shopping cart.

In this video, you will learn how to add shopping cart and application user repository.

In this video, we will implement the category repository.