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  •   How does an animal or bird sense Earthquakes and natural disasters beforehand?#5533

    The underlying mystery is their sharp senses. Animals have a hearing range better than the humans (20Hz to 20,000Hz). During a storm or earthquake, such animals and birds with these sharp senses ranging from very low frequency (infrasound) to high frequency sounds (ultrasound) will detect the foreshocks and go crazy. If humans could hear these low frequency sounds, we would act weird too. AFAIK this is the only plausible explanation that science can confirm yet.

  •   Why most wind turbines have three blades while one is the most efficient design?#5429

    This is very interesting. Thank you for the detailed answer Karthik.

    But in smaller windmills like the one used to draw water by running pumps, you would need more blades as it gives a high torque.

    The above statement makes sense. While considering the same case of multiple blades to a larger turbine why does it fail? What if the larger turbines used thin blades that are designed in a way not to affect the other blades? Would a five-bladed turbine be more efficient?

  •   How does an animal or bird sense Earthquakes and natural disasters beforehand?#5543

    Not so many are into this though.

    This is because there is no practical way in reading animal behaviors whatsoever (that includes humans too). No matter how close people study them, they are going to conclude what is already proven.

  •   Can strong smells damage the olfactory receptors?#5507

    Thioacetone. This is so far the smelliest chemical the humans have ever encountered. Read this.

    Two of our chemists who had done no more than investigate the cracking of minute amounts of trithioacetone found themselves the object of hostile stares in a restaurant and suffered the humiliation of having a waitress spray the area around them with a deodorant. The odours defied the expected effects of dilution since workers in the laboratory did not find the odours intolerable … and genuinely denied responsibility since they were working in closed systems. To convince them otherwise, they were dispersed with other observers around the laboratory, at distances up to a quarter of a mile, and one drop of either acetone gem-dithiol or the mother liquors from crude trithioacetone crystallisations were placed on a watch glass in a fume cupboard. The odour was detected downwind in seconds.

  •   Will I suffocate if I sleep by covering my head (and whole body) with blanket?#5495

    Your brain will wake you up anyway!

    This is okay for adults, but totally different for infants. A baby’s brain would not respond to the CO2 build up.

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