I've always been a huge fan of the extensive footnotes in Allan Pierce's "ACOUSTICS" textbook . . . but I've found a new favorite: "Wind Waves" by Blair Kinsman. His writing style is delightfully refreshing for a textbook, but this full-page footnote on the Bernoulli family history is amazing!

Time for another fun movie trailer to entice interest in the first-year graduate course in Acoustics that I'll be teaching for the Graduate Program in Acoustics at Penn State in the Fall 2025 semester. Simultaneously offered online through our distance education program! youtu.be/fKPA5HL76Ps?...

30 years of making animations . . . I'm updating HTML code for my Acoustics and Vibration Animations website (for WCAG accessibility and HTML5) and found an archive of my original website from 25 years ago with a photo of me in my office at Kettering University. www.acs.psu.edu/drussell/demos.html

Brand new video demonstration . . . Standing Waves inside a Cylindrical Cavity. Finding nodal surfaces for acoustic standing wave mode shapes inside a cylinder with "rigid" walls -- a plastic CD container. #iteachphysics #acoustics youtu.be/-4IqtGhWe2U?... via @YouTube

Really good preliminary summary of what we know so far about torpedo bats by my fellow bat researcher @pobguy.bsky.social blogs.fangraphs.com/the-physics-...

My favorite way to spend a quiet Sunday evening.

What a stupid waste of money. @PSUEngineering is replacing many dozens of doors in our 6 month old new building because the wood veneer on some doors has some unsightly wood knots. Here’s my office door (with ugly knots) that is slated for replacement. What a stupid waste of $$.

So during a 5-minute "lightning round" #ASA187 session this morning, I complained that someone else's 5-minute talk lasted 12 minutes. Well, this afternoon I contributed to a 5-minute lightning round session. Any guesses as to how long my own "5-minute" talk lasted? 🤦‍♂️🤦‍♀️🤦

Listening to the keynote address for #ASA187 . . . humorous inverse correlation => larger larynx (deeper + louder vocal production) in howler monkeys correlates to smaller testicles. Bigger balls means less powerful and higher sounding howl.

Audio/Video demonstration of an "acoustic thermometer" => how the speed of sound changes with temperature — observed as a change in the resonance frequency of a short closed-open pipe. youtu.be/9Pmsn_JZU-4 #iTeachPhysics

During the current migration to 🦋 I have gained lots of new #iTeachPhysics follows including many people I don’t recognize from X. I currently teach grad level acoustics but my waves and vibration animations website is useful for HS and undergrads students: www.acs.psu.edu/drussell/demos.html

just heard a cool presentation at the ASA 187 Virtual Meeting . . . taking each element in the periodic table and creating an audible sound based on the atomic emission/absorption spectrum for that element. academics.skidmore.edu/blogs/jlinz/

1/2 Next year my graduate program is moving into a new building (currently under construction). My office will be smaller and I've been told I have to downsize from 4 completely full bookshelves to 2 (yikes!). So, I made a first pass thru my office library to identify books . . .

Went through some of my parents’ photos after dad died last year and found this autographed photo of Tenzig Norgay (2nd person to the top of Mt Everest in 1953 behind Sir Edmund Hillary). I got this photo as a kid in Hong Kong in 1976 but thought it was lost years ago. Wonder if it’s worth any $$?