Diffraction of DNA and the DNA of my Physics Class Physics Alive

In this episode, I talk about DNA: a simple DNA diffraction and interference experiment using the spring from a pen, and the DNA, the structure of my introductory physics class during the spring '22 semester. 
 
Full show notes at:
www.physicsalive.com/dna
 
DNA Diffraction and Interference Lab and/or Demonstration




Figure 1: X-ray diffraction pattern of B-DNA labeled Photo 51 by Rosalind Franklin.

Figure 2: Interference pattern from a pen spring. Pattern produced from a red diode laser passing through the spring from a pen. Projected on a screen 8 meters away.
Here are the articles I referenced about DNA interference and diffraction experiments:
DNA Science AAPT Digi Kit
How Rosalind Franklin Discovered the Helical Structure of DNA: Experiments in Diffraction

Revealing the Backbone Structure of B-DNA from Laser Optical Simulations of Its X-ray Diffraction Diagram


X-ray diffraction and DNA optical transform from the ICE (Institute for Chemical Education) Online store at wisc.edu
Optical transform demo kit
DNA optical transform kit

DNA of Brad's introductory physics class (Spring 2022)
Star grading system:



Here's the entire syllabus for the spring 2022 semester of PHYS 105: Survey of Physics II for life science majors:
Moser Syllabus 2022 Spring
Specifications grading:
"Specifications Grading" by Linda Nilson
Short article about Specs Grading by Linda Nilson
Blog post on Specifications Grading by Robert Talbert