Chalk.  What is it?  Is it household dust?  I gave myself 20 mins to go find out more about the subject.  Now I'm sharing with you what I found out.  Yes, you are allowed to subscribe.  Please feel free to share this on Social media and let me know if there is a subject you would like covered.  Thumbs up and a positive review would be great!

https://www.britannica.com/science/chalk

https://en.wikipedia.org/wiki/Chalk

Want to see it?  https://twitter.com/ferrisjabr/status/1022534132415356928/photo/1

Music: Cheeky by Shane Ivers - https://www.silvermansound.com