If curious, here are the significant past threads I found. Others?

An Introduction to Crystal - https://news.ycombinator.com/item?id=26217013 - Feb 2021 (39 comments)

Switch from Ruby to Crystal - https://news.ycombinator.com/item?id=25005780 - Nov 2020 (35 comments)

Go vs. Crystal Performance - https://news.ycombinator.com/item?id=23615303 - June 2020 (160 comments)

Ruby vs. Crystal Performance - https://news.ycombinator.com/item?id=23431941 - June 2020 (148 comments)

Crystal 0.34 - https://news.ycombinator.com/item?id=22800139 - April 2020 (31 comments)

Towards Crystal 1.0 - https://news.ycombinator.com/item?id=22725829 - March 2020 (32 comments)

Crystal 0.33 - https://news.ycombinator.com/item?id=22331005 - Feb 2020 (42 comments)

Nim vs. Crystal - https://news.ycombinator.com/item?id=21883882 - Dec 2019 (147 comments)

Lilith: x86-64 OS written in Crystal - https://news.ycombinator.com/item?id=21860713 - Dec 2019 (251 comments)

Crystal 0.31 - https://news.ycombinator.com/item?id=21053366 - Sept 2019 (15 comments)

Parallelism in Crystal - https://news.ycombinator.com/item?id=20897029 - Sept 2019 (41 comments)

Crystal 0.29 - https://news.ycombinator.com/item?id=20110253 - June 2019 (7 comments)

Crystal 0.28.0 Released - https://news.ycombinator.com/item?id=19694006 - April 2019 (30 comments)

Crystal 0.27.0 released - https://news.ycombinator.com/item?id=18370498 - Nov 2018 (36 comments)

Crystal 0.26.0 released - https://news.ycombinator.com/item?id=17753367 - Aug 2018 (40 comments)

Crystal 0.25.1 released - https://news.ycombinator.com/item?id=17424639 - June 2018 (152 comments)

Crystal 0.25 - https://news.ycombinator.com/item?id=17319689 - June 2018 (68 comments)

Why Crystal Is My Next Language - https://news.ycombinator.com/item?id=17280969 - June 2018 (192 comments)

The Crystal Programming Language - https://news.ycombinator.com/item?id=16842442 - April 2018 (73 comments)

Why I'm excited about Crystal in 2018 - https://news.ycombinator.com/item?id=16221053 - Jan 2018 (7 comments)

Crystal 0.24.1 released - https://news.ycombinator.com/item?id=16021965 - Dec 2017 (22 comments)

Overview of the Crystal language - https://news.ycombinator.com/item?id=15945262 - Dec 2017 (90 comments)

Crystal in Production: Diploid - https://news.ycombinator.com/item?id=15574714 - Oct 2017 (120 comments)

Journey from Node to Crystal - https://news.ycombinator.com/item?id=15240984 - Sept 2017 (6 comments)

Crystal Lang vs. Node.js vs. Go Benchmarks - https://news.ycombinator.com/item?id=14368050 - May 2017 (10 comments)

From Ruby to Crystal: A Quick Look - https://news.ycombinator.com/item?id=13949353 - March 2017 (43 comments)

Building a Command-Line Application with Crystal - https://news.ycombinator.com/item?id=13945591 - March 2017 (33 comments)

Porting Ruby to Crystal - https://news.ycombinator.com/item?id=13837109 - March 2017 (34 comments)

A new year resolution to have Crystal reach the 1.0 milestone in 2017 - https://news.ycombinator.com/item?id=13281333 - Dec 2016 (78 comments)

The Crystal Programming Language - https://news.ycombinator.com/item?id=13209575 - Dec 2016 (193 comments)

Crystal: Fast as C, Slick as Ruby - https://news.ycombinator.com/item?id=12223395 - Aug 2016 (429 comments)

Kemal: Fast, simple web framework for Crystal - https://news.ycombinator.com/item?id=11143811 - Feb 2016 (16 comments)

The future of the Crystal language - https://news.ycombinator.com/item?id=10803635 - Dec 2015 (36 comments)

Crystal-Lang – Beauty of Ruby, Faster Than Go - https://news.ycombinator.com/item?id=10014178 - Aug 2015 (31 comments)

Amethyst – Rails inspired web-framework for Crystal language - https://news.ycombinator.com/item?id=9716508 - June 2015 (8 comments)

Crystal Language - https://news.ycombinator.com/item?id=9669166 - June 2015 (171 comments)

Crystal: the programming language - https://news.ycombinator.com/item?id=8658358 - Nov 2014 (51 comments)

Meet Crystal language in its birthday. It is compiled and has ruby like syntax - https://news.ycombinator.com/item?id=6342609 - Sept 2013 (84 comments)