diff --git a/nix-for-php-developers/slides.md b/nix-for-php-developers/slides.md
index 38a6e25..0e8adfb 100644
--- a/nix-for-php-developers/slides.md
+++ b/nix-for-php-developers/slides.md
@@ -4,7 +4,7 @@ footer: oliverdavies.uk
 ---
 
 <style>
-section { 
+section {
   place-content: start;
 }
 
@@ -19,7 +19,7 @@ section {
 }
 
 h1 {
-  ont-size: 2rem;
+  font-size: 2rem;
 }
 </style>
 
@@ -36,17 +36,48 @@ https://www.oliverdavies.uk
 
 ---
 
+<style scoped>
+section {
+  place-content: center;
+}
+
+h1 {
+  font-size: 2rem;
+}
+</style>
+
+# Nix for ~~PHP Developers~~ everyone
+
+<br>
+<br>
+
+Oliver Davies (opdavies)
+
+https://www.oliverdavies.uk
+
+<!--
+PHP examples, but apply to other languages.
+Replace PHP with your language of choice
+-->
+
+<!-- _paginate: false -->
+
+---
+
 # About Me
 
-- PHP since 2007.
-- Drupal since 2008.
-- Full-time Linux since ~2015.
-- Nix/NixOS since 2022.
+- PHP since 2007
+- Drupal since 2008
+- Full-time Linux since ~2015
+- Nix/NixOS since 2022
+- Gave my first presentation at unified.diff in September 2012
 
 <!--
 PHP and Drupal Development. Linux-based infrastructure and systems administration. Automation.
 
 Vagrant, Puppet, Ansible.
+
+This is talk #107
 -->
 
 ---
@@ -153,6 +184,15 @@ Ecosystem of tools. Home Manager for user home configuration, nix-darwin for man
 
 ---
 
+# What is Nix?
+
+- Package manager
+- Build tool
+- Operating system
+- Language
+
+---
+
 ![](./nix-search.png)
 
 <!--
@@ -257,31 +297,32 @@ $ which php
 
 $ php -v
 
-PHP 8.3.6 (cli) (built: Jul 14 2025 18:30:55)
+PHP 8.3.6
 ```
 
+<!--
+One version of PHP installed globally.
+-->
+
 ---
 
 # Running PHP with Nix
 
 ```shell
-$ nix run nixpkgs#php \
-  --extra-experimental-features 'nix-command flakes' \
-  -- -v
+$ nix run nixpkgs#php -- -v
 
-PHP 8.4.11 (cli) (built: Jul 29 2025 15:30:21)
+PHP 8.4.11
 ```
 
 ```shell
-$ nix shell nixpkgs#php \
-  --extra-experimental-features 'nix-command flakes'
+$ nix shell nixpkgs#php
 
 $ which php
 /nix/store/s4kv9bzqawhqcyjg9xm2hji3jap6d6kd-php-with-extensions-8.4.11/bin/php
 
 $ php -v
 
-PHP 8.4.11 (cli) (built: Jul 29 2025 15:30:21)
+PHP 8.4.11
 ```
 
 <!--
@@ -294,6 +335,24 @@ Arbitrary commands and ephemeral shells.
 
 ---
 
+# Running PHP with Nix
+
+```
+$ nix run nixpkgs#php83 -- -v
+
+PHP 8.3.25
+```
+
+<br>
+
+```
+$ nix run nixpkgs#php82 -- -v
+
+PHP 8.2.29
+```
+
+---
+
 # Using a `shell.nix` file
 
 ```nix
@@ -412,7 +471,7 @@ inputs = {
 ```
 
 <!--
-You can have multiple versions of Nix installed at once.
+You can have multiple versions of Nix and applications installed at once.
 
 Pin to a stable version of nixpkgs or a specific commit.
 
@@ -585,6 +644,12 @@ h1 {
 
 # Nix is like `nvm`<br> for everything
 
+<!--
+If there are multiple versions in nixpkgs, like PHP, you can pick the version you need.
+
+If needed you can pin nixpkgs to a specific version for that project.
+-->
+
 ---
 
 # My ideal environment
@@ -598,13 +663,13 @@ $ cd ~/my-project
 
 $ php -v
 
-PHP 8.4.10 (cli) (built: Jul  2 2025 02:22:42)
+PHP 8.4.10
 
 $ cd ~/another-project
 
 $ php -v
 
-PHP 8.3.24 (cli) (built: Jul 29 2025 15:48:33)
+PHP 8.3.24
 ```
 
 ---
@@ -717,6 +782,10 @@ php.buildComposerProject2 (finalAttrs: {
   # ...
 ```
 
+<!--
+Existing builders for PHP, node, Go, etc, and functions to download source code from GitHub, GitLab or any remote URL.
+-->
+
 ---
 
 # Packaging PHP for Nix
@@ -763,7 +832,6 @@ nix build
     └── index.md
 ```
 
-<!--
 ---
 
 # Building Nix packages
@@ -787,7 +855,24 @@ This derivation produced the following outputs:
 
 Phpactor 2025.03.28.0
 ```
--->
+
+---
+
+# Not sure?
+
+Want to try it, but you're not sure?
+
+<br>
+
+```shell
+$ docker run --rm -it nixos/nix
+```
+
+<br>
+
+```shell
+$ podman run --rm -it nixos/nix
+```
 
 ---
 
@@ -798,6 +883,5 @@ Phpactor 2025.03.28.0
 - https://wiki.nixos.org/wiki/PHP
 - https://nixos.org/manual/nixpkgs/stable/#ssec-building-php-projects
 - https://code.oliverdavies.uk/opdavies/lab
-- https://code.oliverdavies.uk/opdavies/drupal-nix-flake-example
 - https://code.oliverdavies.uk/opdavies/nix-config (laptop and home server)
 - https://books.oliverdavies.uk/nix-for-php-developers (book, in progress)