How Many Laser Pointers Would You Need in Order to Kill a Human?

Scientists seem to have a lot of time on their hands if this is anything to go by, but hey ho, if you quite liked the idea of world domination while using a death ray, then this article is for you.

A single laser pointer is not anywhere near powerful enough to inflict a nasty end on one’s enemies due to having a power rating of 5-milliwatts. According to James Kakalios who is a physics professor at the University of Minnesota and the author of “The Physics of Superheroes”, what a job that is, makes the point that it’s in reality quite tough to kill a human being with lasers. But he did have a go at explaining it by stating that the most effective way to use a laser on a human is to “target the eye and thus melting the brain”, blimey, he must be fun at dinner parties.

So, how many lasers would you need? Well, according to Rebecca Thompson of the America Physical Society, you would need a laser at approximately 1KW, this equates to around 200,000 laser pointers. You would also need each laser pointer to focus through a lens on one spot with the aim of concentrating enough power. Every laser beam would also need to be in a “semi-circle with a radius of about 5.5”, so in theory you could buy 200,000 “laser pointers before mounting them on a Sphere with a radius of 5, 5 and aim them all through a lens.”

So yes, there you go, now you can in theory build your own death ray, well sort of, (quick disclaimer, eTeknix would advise that no one attempted to build their own death ray, we do want readers that are not melted.)

On a side note, below is a video that shows this concept being conveyed at an insane level, a Youtuber who goes by the username “styropyro” has built his own Laser shotgun which has a combined power of 40W, as you do. Guns are a problem within society, let’s hope no one decides to use laser weapons instead.

Counter Strike: Global Offensive’s Well-Known Bug Gets Acknowledged by Valve

If you are a Counter Strike: Global Offensive player, then you probably know about the bug. However, let’s outline it again for those of you who might not have experienced it, though it is highly unlikely if you have played the title by now.

In a shooter video game, there are two main coding aspects to take into account when firing a weapon at a character. First, the actual bullet/ray, or whatever you want to call it, is triggered once you fire the gun to check the direction and objects it hits in that direction.

The second most important aspect is once a character is hit by the bullet, it needs to find out what part of the body is hit to appropriately reflect the player’s damage/health.

This is where things go nasty in CS:GO. The hitbox that needs to determine what body is hit is actually a bit quirky, leading to a lot of moments where you want to smash your keyboard because you now you shot him in the head, but he acts like you barely grazed him.

After a couple of videos that clearly emphasise the issue went hot on Reddit, Valve finally acknowledged the bug that has been present in the title since it first launched. However, they were unable to provide an ‘eta’ on the fix. The videos can be viewed below. So how long do you think it will take Valve to solve it?

Thank you Kotaku for providing us with this information
Image courtesy of and videos courtesy of Reddit

Watch: Solar-Powered Ray Can Melt Metal

Kevin Moore and Grant Reynolds from the Science Channel looked at one of their favourite childhood pastimes – burning things with the rays from a magnifying glass – and wanted to magnify it. They wanted to magnify the ray so much so that it could melt metal.

So how do you get that much heat? Pretty simple really. They used an old fresnel lens from a rear-projection TV in place of the magnifying glass, thus increasing the intensity of the light.

The effect, as you can see in the video, is pretty incredible.

Source: Gizmodo