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Two photos of children in Nazi-occupied Poland. One features a Nazi officer who appears to be giving the kids some good-natured advice. But look closely: You can see the image was doctored and the avuncular officer was "photoshopped" in as part of pro-Nazi propaganda efforts.

Gregg's father, Bernard Philipson, standing in front of a tank somewhere in Europe.

Gregg's father, Bernard Philipson, playing baseball.

Gregg's father, Bernard Philipson, and friends standing in front of a half-track (an armored personnel carrier) with a group of children in Europe during WWII.

PowerPoint slides for a presentation Gregg regularly gives to residents at a local senior living facility on Martin Luther King, Jr. Day.

A Polish coin commemorating Irina Sendler, issued in 2009 as part of a series called "Poles Who Saved Jews."

The newspaper obituary for Irina Sendler, who passed away in 2008.

An original, handwritten, six-page letter from Irena Sendler — with its original envelope. Postmarked April 21 at Warsaw, Poland, the cover is franked with two 1941 Mi-75 12 Groschen Deutsches Reich Generalgouvernement Nazi occupation stamps.

An ad for Smith-Corona typewriters, featuring one of "Professor Lucifer Butts'" machines, created by Rube Goldberg.

Most of Goldberg’s legacy is defined by his humor — most prevalently the complex machines he designed to do such simple tasks as brushing teeth or taking photos. Those machines were featured in a Sunday Funnies comic strip that ran from 1914 to 1964, in which Professor Lucifer Butts presents and explains his inventions.

“Exclusive but not expensive,” in downtown Tucson.

Oakland, CA, in 1929, as far “out west” as you can get. And this one isn’t just a hotel—it’s an entire residential district that’s “restricted.”