The Prophet was a merchant.
Is it haram to study business? I'm afraid that my major will be a bad idea if I want to avoid riba. JazakAllah khair
Your Warped Perception of Time
Ever feel like time is rushing by? What about time standing still? Unless you’re traveling close to the speed of light, that just means your brain is playing tricks on you. Learn about the tricks your neurons are playing on you in this new video by BrainCraft.
Bonus: For more on the weirdness of time, head over to Brain Pickings and read about Claudia Hammond’s book Time Warped.
though sea urchins don’t have eyes, they are covered in photoreceptors which collectively act as a retina, effectively making their entire bodies one big compound eye. sea urchins, one of the few marine organisms to have their genome sequenced, have about 23,000 genes (like a human), several of which are associated with sight, including those that govern the development of animal eyes.
"comparing all the genes of the sea urchin, it’s actually quite similar to humans," said george weinstock, who led the sequencing project. they are one of the few invertebrates on the human branch of the evolutionary tree. yet interestingly, they seem to be the only example of a deuterostome to have the rhabdomeric light sensors associated with protostomes, suggesting that rhabdomeric light detectors have been the norm for eyes throughout much of the animal kingdom’s history.
"we think of animals that have a head with centralized nervous systems and all their sense organs on top as being the ones capable of sophisticated behavior, but we’re finding more and more some animals can do pretty complex behaviors using a completely different style," notes sönke johnsen, a marine biologist at duke university who conducted the study on sea urchin vision.
the way that urchins apparently carry out eyesight - with a diffuse nerve net, where no region looks like a central processing unit - reflects how scientists are now often designing robots. “they’re finding it might be a lot better with a distributed system with many little processors and simpler sensors and simple rules, which end up creating fairly complicated behaviors as emergent properties.” [see: starlings post]”
photos of sea urchin tests by paul richman. when alive, tube feet would be seen coming from the holes, which the sea urchin uses primarily for sight, with the smaller dents seen in the test, also containing photoreceptors, used for shading and blocking light. text sources.
This Membrane Can Keep the Heart Beating Perfectly Forever
“Researchers have developed a new device that may one day help prevent heart attacks. The new cardiac device - a thin, stretchable membrane imprinted with a spider-web-like network of sensors and electrodes - is custom-designed to fit over the heart and contract and expand with it as it beats.”
Image Via: University of Illinois and Washington University
through Hashem AL-ghaili
People sometimes forget but there are Muslims who don't follow hadiths so evidence from the Quran is the only thing they're looking to base their religious guidance on. Perhaps that Anon is one of those people so we should all be more understanding when Muslims inquire about the deen in this way.