pendulums are amazing things. but kind of hard to understand first you must know that the pendulum is technically a weight attached to a bar. so it is free to swing these 2 girls make a pendulum and figure that every time you pull the weight back .let it goes it always comes back to the place it used to be from where it started. and then they attached another weight but this is just a cork. and it still does the same amount of swings in another it doesn't matter about the weights. they will stay the same amount of swings and it doesn't matter about the speed. they will always have the same speed and the same amount of swings.
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so I have read this part before but I never told you about it this is quite interesting. called rooster earplugs the rooster lets out a cockle doodle do that has 140 decibels. of sound that's loud enough to defend. you that is why the rooster does it in a high place and away from the hens. so he doesn't deafen them also the rooster has these built-in earplugs that totally block up his ear ducts. also he has a lot of hair or something like that in there so it would have to get through that. see even in this stupid animal God has put in these amazing adaptions or something like that other than adaptions.
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