Amygdaloid Island by Amygdaloid Channel from Isle Royale. It had relatively low visitation until the 1990s, when the growth of sea kayaking made it possible for human-powered visitors to approach the island. The waters of Lake Superior around Amygdaloid Island are notoriously dangerous, and inexperienced kayakers are not encouraged to navigate them. The island is the site of the "Amygdaloid Island Flow", a deposit of basaltic lava with silica inclusions. After the lava cooled, the inclusions hardened into pink agate specimens. The agates of Amygdaloid Island are characteristically almond-shaped or amygdaloidal, hence the name "Amygdaloid". Amygdaloid Island Amygdaloid Island is an island
Jam nut loosening a bolted joint. A jam nut is often used when a nut needs to be locked in place without clamping against another object. The jam nut essentially acts as the "other object", as the two nuts are tightened against each other. They can also be used to secure an item on a fastener without applying force to that object. This is achieved by first tightening one of the nuts onto the item. Then the other nut is screwed down on top of the first nut. The inner nut is then slackened back and tightened against the outer nut. Jam