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Find new derailleur pulleys at Art’s Cyclery: https://www.artscyclery.com/searchresults.html?search=products&searchtext=derailleur+pulley
Freshen up your rear derailleur by servicing one of the most neglected parts on your bike, the humble derailleur pulleys. Just a few minutes, some grease, and some thread locker will save you lost wattage and improve shifting performance.
https://BigBangPhysics.com
Although rare, lightning rods do occasionally get hit by lightning and this tutorial discusses why. We’ll also discuss the safest location to be in a lightning storm, i.e. low to the ground in open areas away from tall structures such as trees or buildings. If you get caught in your boat out at sea, you want to be as low to the deck as possible and away from trees.