Can Legolas see that far?

In Lord of The rings, Legolas can count the exact number of horsemen five leagues (24 km) away and can also say that their leader is very tall. Minute Physics went on to investigate and see if such a thing is really possible. In short words, no. This is because of diffraction as light is […]

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7 days till the end of the world in 2012

Well, the end of the world as we knew it back then. A big double solar flare has missed us by a week. Should it have fired a week earlier in 2012 august 23rd we would have had all our electronics destroyed, sending us back to the stone age. We were darn close at that […]

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The internet and Google in HUGE freaking numbers

The internet is BIG, way too big for anyone to really comprehend it, but we can, at, least, see a summary of what it is in a couple of minutes. About the internet: – 2.9 billion people use it today – 96% of it is the dark web or underweb – S citizens spend at […]

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[Rant] And again: our mass comes from the kinetic and potential energy inside nucleons

Yesterday you could read on this blog that mass and energy are the same, as mass is energy compressed in a given space in a given form. Nucleons, the subatomic particles that form the nucleus, ie the protons and neutrons, contain most of our mass and inside them there are quarks which are bound by […]

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Mass and weight are almost the same – The Equivalence Principle

Mass is the quantity of matter an object has and it is measured in kilograms and weight is the *ahem* gravitational “force” that is attracting the objects towards the Earth and it is measured in newtons. Professor Mike Merrifield from the University of Nottingham explains why mass and weight are almost the same. When we […]

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Gravity is NOT a force

But we have formulas that are checked and double-checked? How could it not be a force? Gravity is not a force, it is a space-time distortion caused by the presence of mass. In other words, if you put two masses in relative vicinity there won’t be a force that attracts each one to the other […]

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What’s the difference between mass and energy?

Nick, from Science Asylum, explains the difference between mass and energy. There is none. Mass is energy compressed in a given space. Most of the weight of a subatomic particle in the nucleus comes from the nuclear strong forces inside the protons and neutrons, not from the particles themselves, like gluons or quarks. Neat, eh? […]

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Rogue planets, wandering around the Galaxy without any Sun to light them

That does not mean that a rogue planet might not have internal heat or atmosphere or megnetic field. Rogue planets are planets that formed a long time ago, but no star has caught them. Usually such rogue planets are formed within star systems, but are kicked out by other, bigger planets. It has been calculated […]

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How to save yourself when choking

If you even choke on something you need to, somehow, push the air back, out of you so that the object you’re choking on can be released outwards. In order to save yourself when choking you need sit on the ground on your knees and on your firsts, like in a push-up position, but when […]

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That’s new: circumcision seems to protect against HIV

Hank Green tells us about experiments that were done in which circumcised people were shown as being protected by the fact that the foreskin was cut off. It seems that there are some weak cells in there that are prone to HIV infection. Removing those protects one against HIV more that you’d think. In any […]

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