He/she wasn’t a very good thief! T ere were the six suspects. We decided we could not use real people as suspects so we chose to go with Harry Potter villains. • Delores Umbridge - When she was interviewed Delores Umbridge was wearing a red fl ower. She has brown straight hair; She had sandy shoes because she played golf and her golf ball went into a sandy bunker; She was dressed in pink clothes.

• Bellatrix Lestrange - When she was interviewed: Bellatrix Lestrange was wearing a pink fl ower; she has brown straight hair; she had sandy shoes because she was in the garden; she was wearing blue clothes.

• Draco Malfoy - When he was interviewed Draco Malfoy was wearing a lily fl ower; he has blond straight hair; he had sandy shoes because he took a short cut through the sand box in the garden; he was wearing grey clothes.

• Voldemort - When he was interviewed: Voldemort was wearing a red fl ower; no hair; he had sandy shoes because he went hiking along a trail in California; he was wearing grey clothes.

• Lucius Malfoy - When he was interviewed: Lucius Malfoy was wearing a pink fl ower; he has blond straight hair; he had sandy shoes because he went hiking along a trail in California; he was wearing black clothes.

• Severus Snape - When he was interviewed: Severus Snape was wearing a lily fl ower; he has straight grey hair; he had sandy shoes because he played golf and his golf ball went into a sandy bunker; he was wearing black clothes Mostly the clues fi t whatever materials we had, such as what three

fl owers with lots of pollen were available to us that day. Two suspects for each clue. We didn’t want one clue to give the suspect away. It had to be two clues. Each group took on one type of material. On the stub there were three possibles and the actual to compare. So we had a fl ipchart at headquarters (the Outreach Booth) with the suspects down one side .and clues along the top. As each of the four groups got their answer they put a tick in the right box. It worked just fi ne. In Portland, we had access to an X-ray analysis SEM. T e story was: Someone came to the desk in the Museum and handed an envelope over to the cashier. Written on the envelope was “Put all the cash in the envelope and don’t say anything. I’ve got a gun!” She complied but followed him to see where he went. He took a bicycle and went through a construction site (sand), scraped the bike along a wall (metal for X-ray analysis), over a fl ower bed (pollen) which had thorny rose bushes (fi bers). By that evening the police had four suspects each with sandy shoes and bike wheels, diff erent materials making up the bikes etc.

In Nashville: Someone stole a very valuable Elvis guitar and put it up for sale clandestinely. One of the potential buyers wanted it authen- ticated by identifying the strings by X-ray analysis. I went to our local music store and asked if they had any strings from 1960s. T ey gave me one and I bought a new one. T e composition is very diff erent and easy to identify by X-ray analysis.

Now I need a story for Baltimore. I’ve never been to Baltimore. Is there something special we can use in a story? Elaine Humphrey ech@ T u Nov 30

Edgar Allan Poe theme? T e Murders in the Rue Morgue? Probably not “the Pit and the Pendulum” or “T e Cask of Amontillado” Not sure what you could do with crab cakes! I believe that McCormick’s has a large spice facility near the harbor front. We could smell it the last time we were there. Henk Colijn Fri Dec 1


Michael Phelps, the American sports champion, was born in Baltimore. You can make some plans related to his medals! A number of metallic medals with surface patterns can be designed, cut, and painted in yellow or silver or bronze colors, similar to those awarded in sports competitions. T e question can be “Which medal belongs to Michael Phelps (if any) and which one is fake?” Details can be designed in a way that participants need to do microscopy work and chemical analysis to fi nd out the answer! Nima Nikpoor Badr 14nnb1@queensu. ca Fri Dec 1

Unfortunately the McCormick warehouses moved up to the north side of the city many years ago. I miss the smells that were there by the Inner Harbor. There is also a railroad theme in that the first railroad station (B&O) is situated just west of Baltimore. There could be steel, coal, and slag involved. There is the Johns Hopkins Hospital with a plethora of medical samples (blood?). The Chesapeake Bay has lots of biota. There is the infamous Chromium smelting talus that the Inner Harbor is partially built on (maybe you don’t want to have samples of Hexavalent Chromium around). Also, the Babe Ruth Museum for a baseball theme (including the Orioles). The Poe theme can have both raven’s feather and Ravens leather. To add a twist to that John Astin (Gomez Addams from the Addam Family) was born here and teaches at Johns Hopkins. Then there is history of Frederick Douglas and the Underground Railroad. Fort McHenry where the Star-Spangled Banner was penned by Francis Scott Key and the flag sewn by Mary Pickersgill in 1813 that resides in the Smithsonian. There are cloth fibers (red and blue wool and white cotton) and gun powder themes here. Enoch Pratt Free Library — one of the oldest libraries in the US, Peabody Library focused on music (paper, vinyl, tape). There’s much more but I have to do some work today. Ken Livi klivi@jhu. edu Fri Dec 1

Baltimore is a great city, some faults notwithstanding. It has a wealth of old buildings and structures that have built up many layers of paint. I collected a nice thick paint sample (many layers) from a lamp post near Fell’s Point to compare with some samples I collected on our campus. T is was used in the SEM/EDS section of a graduate instru- mentation class. I called it “ T e Doorway, T e Downspout and the Lamp Post”. It was a great introduction to examining various colors and constituents in paint layers, as well as to restoration processes. Lead paints could be dated as pre-the late 1950s. Wallace Ambrose Mon Dec 4

EDS: high intensity low energy peak

Our EDS is showing a high intensify peak at about 0.2 keV even with beam-on vacuum. We’re not getting C signal anymore, and the energy resolution is getting worse. T ere has been an energy shiſt also. T e issue remains aſt er run an automatic calibration. Does anybody know what more could be done? Or is it a sign that our detector is almost dead? Erico Freitas Sun Nov 19 T is sounds to me as there is an issue with an additional light in the chamber. Make sure that all light sources—especially chamber scope—are turned off . A little bit tricky might be a touch alarm: on some SEM (do we talk about SEM?) the stage alarm triggers some safety light barrier to prevent another collision. To turn these lights off , you have to initialize the stage. If you can exclude additional light in the chamber, there is maybe an issue with the detector: it can be the cooling system or some issue with the preamp of the SDD/SiLi. I hope that helps. In general, EDS detectors are very sensible to all kind of light, not only the X-ray you want to see. Ferenc Molnar Mon Nov 20 • 2018 March

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