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Can 1 equal 2? Spot the error
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A defining features of learning mathematics is being able to read, write, and discover proofs. A proof is a method of communicating a mathematical truth to another person who speaks the "language" of mathematics. It's a way of showing whether a statement made is absolutely true or false. I recently came across a fallacious proof attempting to show that the integer one equals two – shown are the steps to accomplish this. Common sense dictates that this is impossible, but the proof is somewhat convincing to the untrained eye. However, most people with basic algebraic knowledge should be able to pick out the mistake, so take a minute or two to see if you can identify the incorrect step. If you're stuck, don't give up so quickly! It's easier th ...
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39537 |
bio_man |
2 years ago |
Is cracking your knuckles bad for you?
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I've always told my students that cracking your joints leads to arthritis. Perhaps I've been wrong all these years, watch this video to find out more:
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32132 |
duddy |
9 years ago |
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2 |
30388 |
ehd123 |
9 years ago |
A dedicated octopus
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Watch an octopus walk out of the water, drop a crab shell at the feet of some humans and amble back again.
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28992 |
duddy |
9 years ago |
Can plastic be converted back to oil?
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Start by watching the video below In the video, a Japanese man converts plastic waste into usable oil and fuel using a machine that thermochemically decomposes the plastic in a process known as pyrolysis. Pyrolysis works by thermochemically breaking down material at temperatures above 350 degrees Celsius in the absence of water. This not only physically melts down an object, but also changes its chemical composition so that, in the case of plastic waste, it reverts back into boiling liquid and eventually gas. Source: http://www.sciencealert.com/holy-crap-watch-this-guy-turn-plastic-back-into-oil ...
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28006 |
duddy |
9 years ago |
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24637 |
ehd123 |
8 years ago |
Rhino beetles are ginormous bugs
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Rhino beetles and other ginormous bugs are kept as pets, used in gambling fights, and also eaten as food. You've got to see the size of these things!
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23416 |
duddy |
9 years ago |
150 thousand people are going to die today
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It's true, and this estimate is the same for tomorrow, and the day after. This video explains the Years of Life Lost measurement - a measurement which takes into account the age at which deaths occur by giving greater weight to deaths at younger age and lower weight to deaths at older age (more information can be found here). The video neatly displays the leading causes of death in each country from 2013. According to statistics, Saudi Arabia really needs to chill out with its driving antics given that death by vehicle is the leading cause of early death there at 19 people per day! ...
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23290 |
duddy |
8 years ago |
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21596 |
duddy |
9 years ago |
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21316 |
duddy |
8 years ago |
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21295 |
duddy |
8 years ago |
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21134 |
duddy |
9 years ago |
World's heaviest calculator?
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Oven a century ago, people were using technology to help them solve math problems. This 100-year-old calculator still works today, and it can calculate into the billions. While the machine may be mathematically accurate, it weighs approximately 70 pounds, significantly more than modern day calculators. That doesn’t sound very convenient. But then again, imagine how strong you would get carrying a 70-pound calculator around school ...
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20998 |
duddy |
8 years ago |
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17497 |
ehd123 |
9 years ago |
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16999 |
duddy |
9 years ago |