I learned how to make soft pretzels from scratch, and that there might be a bee hive under my bathtub.

I learned that I've been doing a stitch wrong in my current lace knitting project. Now I have to decide whether or not to just keep going, doing it wrong consistently or start over doing it correctly. The over-arching lesson is that my perfectionism sits uneasily with my inexperience and I really need to not let it paralyze me.

Also, I really really like this question!

Stopsky's Deli on Mercer Island fired their chef and now the food blows.

I learned about the use of the subjunctive with conjunctions of time and conjunctions of purpose in Spanish. For example, "a menos que" ("unless") always takes the subjunctive, and so does "antes de que" ("before"), but "tan pronto como" ("as soon as") only takes the subjunctive if the action is pending. If it is completed, or habitual, it takes the indicative.

I also learned that my ability to retain information about the use of the subjunctive with conjunctions of time and purpose is nil.

I learned how to make a mojito! Yum!

I learned to play the first part of the Irish jig "The Haunted House" on flute.

I learned from Seattle Transit Blog that the Amtrak Empire Builder's on-time performance has been hovering around 10-15%. That's really, really bad. It's because of drainage problems in North Dakota. Hopefully, the poor performance might motivate us to start our own regional train from Seattle to Spokane, the way WSDOT and Amtrak did with the Cascades from Vancouver, BC to Portland/Eugene.

I learned everything a person needs to know about flaws in witness identifications.

Sarcoidosis often presents very similarly to leprosy, with skin lesions and joint pain, but nearly always has lung involvement. The cause of the disease is unknown, and there are no particularly effective treatments, but it resolves on its own in 30%-50% of cases.

(And yes, I have been known to share that type of information at the dinner table. Perhaps that is why I am rarely invited to dinner.)

Mulitple Personality Disorder now know as Dissociative Identity Disorder is not a personality disorder but a dissociative disorder, as the newer name identifies. Dissociative disorders are characterized by loss or awareness or memory and are often caused by trauma or substance use. Personality disorders are based on extreme variation for the cultural norm in personality traits which cause serious disruption in a person's life. They include:
Antisocial personality disorder,Borderline personality disorder, Dependent personality disorder, Obsessive-compulsive personality disorder, Schizoid personality disorder and others.

I learned that Greece is continuing to fall apart and that it's possible they could actually default on their debt. I did NOT learn that the Europeans are always doing crap like this and that we are following in their dangerous footsteps with this BS wrangling over our own debt ceiling limit.

I also learned that ICANN, those people who manage domain names on the Internet, are releasing a new option to have a custom domain extension. So for e.g. Apple could have .apple instead of .com. But, the new domain extensions will cost about $500,000 dollars to acquire, set up and maintain (WTF?).

I love this question. Thanks for asking it. I know I learn things every day but the processing speed is such that I never stop and think about it and so I don't even think about whether knowing it makes any difference. It's good to stop and think.

I learned that a $10 roll of quarters weighs exactly half a pound, i.e. eight ounces.

I learned about Edward Said's concept of "structures of reference" while reading about contemporary African art historical themes.