To celebrate the 20th birthday of Lightsources.org, people working at synchrotron light sources were invited to post a selfie at a light source on social media on May 20 with the hashtag #LightSourceSelfieDay. A number of people from the ALS joined in. Here is a selection of pictures:
![](https://als.lbl.gov/wp-content/uploads/2024/05/Steve-Rossi-413x550.jpg)
![](https://als.lbl.gov/wp-content/uploads/2024/05/Martin-Kunz-450x338.jpeg)
![](https://als.lbl.gov/wp-content/uploads/2024/05/Cindy-Lee-413x550.jpg)
![](https://als.lbl.gov/wp-content/uploads/2024/05/Courtney-Best-450x338.jpg)
![](https://als.lbl.gov/wp-content/uploads/2024/05/1716334747581-450x253.jpeg)
![](https://als.lbl.gov/wp-content/uploads/2024/05/1716236226219-450x338.jpeg)
![A woman in front of some scientific apparatus.](https://als.lbl.gov/wp-content/uploads/2024/05/GOCvejjaMAANMqv-450x493.jpeg)
![A man standing next to some scientific apparatus which has a sign "do not install".](https://als.lbl.gov/wp-content/uploads/2024/05/446799063_10231610163215712_1367313649900812636_n-450x338.jpg)
Some people took their selfie together with other people:
![](https://als.lbl.gov/wp-content/uploads/2024/05/Dongwoo-Kim-Slavo-Nemsak-Gustavo-Zottis-Girotto-450x338.jpg)
![](https://als.lbl.gov/wp-content/uploads/2024/05/Antoine-Wojdyla-Xiaoya-Chong-413x550.jpeg)
![](https://als.lbl.gov/wp-content/uploads/2024/05/Ohanna-Hans-Bechtel-450x338.jpg)
![](https://als.lbl.gov/wp-content/uploads/2024/05/1716228148382-450x338.jpeg)
![](https://als.lbl.gov/wp-content/uploads/2024/05/1716334748045-450x338.jpeg)
![](https://als.lbl.gov/wp-content/uploads/2024/05/Stephanie-Gilbert-Corder-413x550.jpg)
And even Berkeley Lab’s founder E.O. Lawrence joined the fun: