On Friday, a leader from North Korea crossed the Korean Demilitarised Zone for the first time ever to talk denuclearisation and long-awaited peace. It was a truly historic moment, but it's only the latest event in a complicated conflict that's lasted nearly 70 years. Here's everything you should know about the Korean War.

There are a lot of gun terms thrown around in the media these days, like "clip," "casings," and "semi-automatic." But if you're not familiar with firearms, many of these terms might go over your head. This glossary of common gun lingo will help clear things up so you can be an informed part of the conversation.

Last week, the United States and its allies France and the UK fired 105 missiles - most of them Tomahawks - at Syrian targets in an attempt to prevent future chemical attacks in the Syrian Civil War. But what are the alleged chemical weapons being used? And what exactly do they do to people? Here's what you need to know.

The Second World War swallowed up the years between 1939 and 1945, affecting people across the globe and ending as the deadliest conflict in human history. As some of humanity's darkest days, it's origins and legacy are taught in schools across the world. It may be easy to understand who attacked who - but it isn't easy to fully comprehend the scale until it's laid out for you in simple, easy to understand terms.

Just like this two-part video series does.

The recent and terrifying false missile alert in Hawaii has everyone asking, "What if it happened here?" While statistically, your hometown is probably not a nuclear target, historian Alex Wellerstein's NUKEMAP shows you what it would look like.

On the morning of January 13, residents of Hawaii all received a pretty unwelcome push notification: "Ballistic Missile Threat Inbound to Hawaii. Seek Immediate Shelter. This is not a drill."

I was in Hawaii on a family holiday the day of the ballistic missile threat. The alert interrupted our breakfast at Denny’s and we returned to chaos in our hotel, where we were advised to shelter in the bathroom.

I started writing a message to loved ones which I was about to send when it was confirmed it was a false alarm.
The experience shows how important it is to be aware of emergency procedures. Here’s what it was like in those 38 minutes of fear.

You're probably aware that developed nations such as Israel, Russia
and the United States have missile defence systems. But do you know how these systems work? Or how effective they are? They're not the impenetrable shield you think they are.

During a hearing on October 12, experts warned the US House of Representatives that an EMP bomb, likely from North Korea, could kill as many as 90 per cent of all Americans within a year. But what is an EMP bomb? And could such a weapon really be that devastating?

North Korea always seems to be in the news right now thanks to their aggressive threats and missile tests, the latter being the subject of many people's doomsday fears. But where could they potentially strike with the missiles they have?

Brief news items of note for Lifehacker readers, including: Sydney Council takes on iPhone X crowd, the best military movies of all time, Netflix axes House Of Crads in wake of Kevin Spacey allegations.

Video: Back in the '50s and '60s, your home wasn't complete if you didn't have your own fallout shelter. This classic educational video shows you how to build your own.

On Sunday, North Korea detonated what they claimed to be a hydrogen bomb. The weapon test has prompted serious concern from the US and allies. But what makes a hydrogen bomb scarier than a regular atomic bomb?

A next revolution in warfare where killer robots, or autonomous weapons systems, are common in battlefields is about to start. Both scientists and industry are worried.

With a heated global political climate and the threat of nuclear war seeming to loom over our heads, it's hard not to be stressed right now. But you don't have to sit there and stare at your news feed in agony.

It happened. Bright, white light flashed before your eyes, the power of the sun licked your skin, and you felt a shock wave of dust and debris plow through the city you call home. You're one of the lucky ones, for now, but your struggle isn't over yet -- not even close.