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When sun-rays converge
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This was the sky over Guam earlier this week. The effect is caused by antisolar rays - rays of sunlight that converge at a point in the sky exactly 180° from where the Sun is.
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3741 |
duddy |
9 years ago |
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6690 |
duddy |
10 years ago |
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7412 |
duddy |
9 years ago |
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2722 |
savio |
10 years ago |
The Schiller Effect makes stones seem to light up all on their own
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The Schiller Effect (aventurescence) is an optical illusion that makes stones such as labradorite appear to light up internally. The layering of different minerals at a scale near the wavelength of light causes the scattering and interference effect.
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5807 |
duddy |
9 years ago |
Short-circuit your brain
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Your brain is trying to do two things at once. Look at the image and try to say the colour of the word you see, rather than the actual word itself. It’s very tricky to do. The words seem to wrestle in a bizarre power struggle with the colours. This is because the right side of your brain is seeing the colour of the word while the left side is trying to say the word itself.
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6378 |
duddy |
11 years ago |
Shape-shifting metal
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Ever seen 'memory metal' in action? Watch this paperclip - made from an incredible shape-shifting metal called Nitinol - be bent completely out of shape and then restored instantly as it touches a simple bowl of warm water.
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5968 |
duddy |
9 years ago |
Mind-blowing dragon illusion
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This type of optical illusion plays with our brain’s sense of perspective: the dragon’s face looks like it’s sticking out toward us because, after all, we know from a life time of experience that faces stick out instead of cave in. But the exact opposite is actually the case here. Regardless of what you perceive, the entire face of this dragon is inverted making everything backwards: For example, the right eye is actually farther away from us than the left eye, and it’s this inversion that confuses our brains and makes us think the dragon is staring at us. ...
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2638 |
duddy |
8 years ago |
Infinite stairwell
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Check out this amazing "Escherian" stairwell How it's done? it's actually an internet hoax!
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2426 |
bio_man |
10 years ago |
How smart are you? Try this test
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Here are some interesting puzzles for you to solve!What are the next two characters in the following sequences? - A B 1 C D 2 E ___ ___
- B F J N ___ ___
- O T T F F S S E ___ ___
- 3 3 5 4 4 3 5 5 ___ ___
You have 1 minute to complete each challenge. Once you're done, click the button to reveal the answers. Answers:- A B 1 C D 2 E F 3 – (two letters, one number in sequence)
- B F J N R V – (every 4th letter)
- O T T F F S S E N T – One Two Three Four Five Six Seven Eight Nine Ten
- 3 3 5 4 4 3 5 5 4 3 – (number of letters in each number spelled out in #3; e.g., “one” has 3 letters, “two” has three letters, etc.)
Now that you know the answers, how many ...
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1614 |
bio_man |
5 years ago |
How many colours do you see?
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You see those embedded spirals of green, pink and blue? The green and blue spirals are actually the exact same colour. When the green and pink colours are placed side-by-side, they enhance each other’s darker tones, making them look like completely new colours. How we perceive colours is dependant on the light and shadow surrounding them and on the placing of contrasting colours side by side.
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3624 |
duddy |
9 years ago |
Depth perception in babies
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Despite his mother beckoning him to come towards her, this infant hesitates to cross the "visual cliff" – an apparently steep drop that is actually covered by transparent glass. Psychologists in the 1960s found that most infants 6 to 14 months of age were reluctant to crawl over the cliff, suggesting they had the ability to perceive depth. Most psychologists believe that the ability to perceive depth is partly innate and partly a product of early visual experience. Here's a test you can try to demonstrate how your perception of depth is still live and active. Below are two perfect circles, yet the smaller circle appears distorted. Our brain interprets the converging lines to be adding depth to the screen, as if the solid middle is further aw ...
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18865 |
bio_man |
2 years ago |
Curry's paradox, explained
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At some point in your life, you've probably played this game of logic known as the missing square puzzle, or Curry's paradox - named after its inventor Paul Curry. This optical illusion is commonly used in mathematics classes to help students reason about geometrical figures, or rather to teach them to not reason using figures, but only using the textual description thereof and the axioms of geometry. It depicts two arrangements made of similar shapes in slightly different configurations. Each apparently forms a 13×5 right-angled triangle, but one has a 1×1 hole in it. As depicted in the animation, the illusion works because the diagonal of the two internal triangles is not a continuous slope from corner to corner. The overall connected shap ...
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16218 |
duddy |
8 years ago |
Checker shadow illusion
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Block A is the same colour as block B -- proof shown below... I removed all the blocks surrounding A and B, and here's what was found
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3832 |
bio_man |
11 years ago |
Cats don't have beaks!
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Can you spot the cat amongst the pigeons? This is Hungarian artist's - Dudolf - latest optical illusion that has some several viewers puzzled. The cause of all this difficulty is likely to have something to do with the way in which the brain processes visual information, by identifying repeating patterns and then using this to automatically fill in the gaps in peripheral vision. This makes it very difficult to spot minor details or irregularities in our visual field without focusing directly on these elements, which means you probably won't see the cat unless you stare straight at it. ...
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15330 |
duddy |
8 years ago |