Back in 2015, I presented a talk titled "12,232 Thoughts on Laboratory Safety in 25 Minutes or Less" at the Boston ACS Meeting which was based on Ralph Stuart's and my effort to ensure the pearls of wisdom on the list are forever preserved: https://acsdchas.files.wordpress.com/2015/08/m3-toreki-12000-thoughts.pdf

At the time, that's how many archived posts we had on this listserv. As part of that talk, I had constructed a top 25 list of posters and topics by year for comparison. I couldn't remember how I automated that, so I decided with the new year I would figure it out again so I can start this as an annual New Year=E2=80™s tradition.

2021 had less traffic than the past several years: 1,536 articles. The total number of posts is now 24,833. Ralph wears a couple of hats, so it is no surprise he captures the top 3 slots by poster. The top 25 posters of 2021 were:

Name	# of posts
Ralph Stuart	178
Chemical Safety Headlines	150
CHAS membership	131
Monona Rossol	58
Richard Palluzi	56
CHAS membership chair	44
Rob Toreki	40
James Kaufman	31
Neal Langerman	28
Yaritza Brinker	27
Jessica Martin	24
Eugene Ngai	23
Jeffrey Lewin	22
Peter Zavon	21
CHAS imap account	20
Margaret Rakas	19
John Callen	18
Debbie Decker	17
Jack Reidy	16
Alfred Barksdale	15
Dr Bob	15
Peter Reinhardt	13
Tilak Chandra	13
Harry Elston	12
Monique Wilhelm	12

For the subjects, I wrote a script that figured out each topic and counted all of its replies. The one exception is the line titled (original CSH posts only) which does NOT count replies. As you can see, the # of CSH posts corresponds to the number by poster Chemical Safety Headlines above, and is consistent with a normally 3x a week headline delivery.

The top 25 topics of 2021 were:

Topic	# of posts
(original CSH posts only)	150
[DCHAS-L] Glove permeation chart - not company	20
[DCHAS-L] Pentadecafluorooctanoyl chloride.	20
[DCHAS-L] What's in the bottle?	17
[DCHAS-L] ACS Fellows 2021 include Dr. Joseph M. Pickel, Oak Ridge National Laboratory	17
[DCHAS-L] heating/cooling issues	15
[DCHAS-L] 3' Social Distancing "Rule"	14
[DCHAS-L] How would you answer this student question?	14
[DCHAS-L] New Article	14
[DCHAS-L] Achieving DEIR and Safety Awareness in a Chemistry Graduate Program: "Safety, Inclusivity, & Diversity Talks" ("SID Talks") as Part of a Colloquium Series	13
[DCHAS-L] Question for teaching and research university labs	13
[DCHAS-L] Condensation of liquid oxygen in open Dewar flasks of liquid nitrogen	13
[DCHAS-L] Lab Ventilation	13
[DCHAS-L] Liquid nitrogen leak at Georgia poultry plant kills 6	12
[DCHAS-L] Fume hood article of interest	12
[DCHAS-L] lab help for student with prosthetic hand	12
[DCHAS-L] benchmarking O2 monitoring with cryogen use	11
[DCHAS-L] SF6 fume hood certification	11
[DCHAS-L] Haz Waste Characterization Records	11
[DCHAS-L] Chemical Safety headlines (16 articles)	10
[DCHAS-L] excess chemicals, equipment, and supplies	10
[DCHAS-L] Chemical safety communication challenges	10
[DCHAS-L] These new articles for ACS Chemical Health & Safety are available online.	10
[DCHAS-L] Admissions Tours in the Laboratories	10

The full data set is available if anyone wants a copy. I can also generate past years' stats now that I wrote down the Excel procedures to use after my script extracted the data.

Best wishes to all for a safe, happy, and prosperous New Year

Rob Toreki

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