There’s nothing worse than unwanted and uninvited people calling at your door, it can be a real pain especially if you’re home a lot.

Well British inventor Colin Furze has created a way to deal with these pesky guests, by creating an AK47 door bell system. Of course it doesn’t use a real gun, but it will scare the crap out of people nonetheless.

From fire fighter trucks to a Snowmobile racing a Ferrari and other insane combinations, these really are ridiculous drag races.

What’s more some of the outcomes are truly unbelievable, as the title says, especially when it comes to a farm truck versus a Lamborghini.

YouTuber Tom Scott travels to a stretch of water called The Strid on the River Wharfe at Bolton Abbey, Yorkshire, UK.

The reason he’s gone there is he says it’s the most dangerous bit of water on the planet—a bold claim but the reason is because the currents are so strong yet it looks deceptively serene.

Stop-motion animator Kevin Parry has collated together this impressive compilation of his optical illusions which he posts to Instagram videos.

Many of them, like the high-five mirror trick at the beginning, have a ‘how the hell did he do that’ quality that leave you wanting a behind the scenes reveal.

Black holes are fascinating yet very scary things and our knowledge of them and their capabilities is limited.

But although limited we’re beginning to understand their complexities and the mysteries they hold more and more. In fact as this video show, they may in fact reveal the true nature of the universe to us.

We’re all liable to be victims of hackers these days, from the average person to huge corporations, nothing or nowhere is safe. And the more of our objects that go online, the more objects can be hacked.

YouTubers GradeAUnderA takes a look at the subject and provides a guide to keeping yourself as safe and ensuring you’re 100% hack proof—or as hack proof as possible, anyway.

With each new generation of computer the computing technology gets smaller and more compact, not so with James Newman,of Cambridge, UK who recently finished his Megaprocessor.

The huge piece of tech is a fully functional, and educational, CPU—it has LEDs that light up at the various stages of the computational process so people can see how data moves through a circuit.

Richard Browning is the inventor behind an Iron Man-like flight suit that uses jet power to propel the wearer skywards.

It’s pretty crazy, and Adam Savage heads off to meet him, discussing the suit and also getting a demo of its impressive abilities.