For those of us in the northern hemisphere, today is the hiemal solstice. Today is the shortest day of the year, and for the next half of the year, the period of daylight will only get longer.

Since ancient times, people have marked this day each year, through celebration and through the construction of buildings that line up with the sun or stars on this day; for instance, Stonehenge in Britain and Newgrange in Ireland both act as solstice indicators. Celtic, Chinese, Indian, ancient Roman, and even ancient Hebrew solstice ceremonies are recorded in various forms, with some (such as Newgrange) dating as far back as 3200 BC.

Today, many of these solstice ceremonies have been wrapped up into the Christian winter holiday of Christmas. For instance, the Celtic tradition of hanging evergreen plants, such as holly and ivy, as a sign of hospitality became the British Christian tradition of hanging mistletoe. Even the Jewish holiday of Hanukkah bears a striking resemblance to the Celtic idea of the Yule Log, a fire that was meant to burn for twelve days without re-fueling.

In addition, the solstice itself remains meaningful to many, both in mainstream religions and in neo-Pagan revival movements. So, to all of you who celebrate, happy Solstice, and may the sun shine warm on your face for the rest of the year.

Today's problem description: https://adventofcode.com/2021/day/18

Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

<details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>

Today's problem description: https://adventofcode.com/2021/day/21

Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

<details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>

Today's problem description: https://adventofcode.com/2021/day/17

Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

<details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>

General Programming Q&A thread! Ask any questions about programming, answer the questions of other users, or post suggestions for future threads.

Don't forget to format your code using the triple backticks or tildes:

Here is my schema:

```sql
CREATE TABLE article_to_warehouse (
  article_id   INTEGER
, warehouse_id INTEGER
)
;
```

How do I add a `UNIQUE` constraint?

As part of a weekly series, these topics are a place for users to casually discuss the things they did — or didn't do — during their weekend. Did you make any plans? Take a trip? Do nothing at all? Tell us about it!

"It's too early for Christmas", you may be saying, but you may also be a Scrooge and I won't abide by it. Christmas is just about 2 weeks away and I'm ready to listen to some Christmas music. So what are some of your favorites?

Also any non-Christmas December holiday music can be shared as well! I'm just not aware of any of the others having much music (unless you're into that Adam Sandler song).

edit: I put together a Spotify playlist of everything (so far as of Dec 13 @ 1pm EST) -- https://open.spotify.com/playlist/7FY6Ngmo60so3xzy3xCTY5?si=729f98cd8da34283

edit 2: I've been adding songs as they trickle in. Last updated Dec 20

Today's problem description: https://adventofcode.com/2021/day/20

Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

<details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>

This thread is posted weekly, and is intended as a place for more-casual discussion of the coronavirus and questions/updates that may not warrant their own dedicated topics. Tell us about what the situation is like where you live!

Today's problem description: https://adventofcode.com/2021/day/15

Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

<details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>