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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Terraforming Venus? A kids job and a few hundred years of work.

Could we terraform Venus? Not now, but this coudl be certainly a task for future us, maybe in 100-200 years. First, Venus has a thick atmosphere with a pressure 91 times stronger than ours, then there is a lot of heat in there, over 300 degrees Celsius, a lot of CO2 and it rains with […]

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Amaze your friends with these new 10 bets from Quirkology

Richard Wiseman, from Quirkology, teaches us 10 new tricks we can do when we go out with our friends. The 10 GBP bill trick, the black and white disc trick and missing square problem sound like the greatest hits at a beer table someday. Maybe I’ll try them out to test my Jedi skills :d

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17 or 19? Puzzle problem: bridge crossing at night

Say you have four lads that want to cross the bridge at night and only a max of two can do this at once. There is a catch: the lamp needs to be always with the guys that are crossing the bridge and also, the faster one needs to cross the brider at the pace […]

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Get yourself a Jibo

Jibo is a robotic assistant that will help you around the house with being… neat, nothing more. Well, it can take pictures and can change its position to face you all the time, it has a neat voice and can read messages to you. Other than that, it may be used as a platform for […]

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