I dont really know whats age appropriate for a 12 year old but BobbyBroccoli has some good science controversy videos. He has a good series of videos on a physics scandal and a video on another physics scandal. He uses some cool visualizations and I like how he talks about the science and the people involved. Theres also cold fusion. One of the fusion videos has a title thats worrying but no one dies, its making a point.

Too dark at her age probably but maybe good as a teenager. I listen to Fascinating Horror who covers various disasters in 15 mins or less. I liked that the videos arent sensationalized. He always says the victims names and backgrounds, the circumstances leading up to it and the fallout. Like theres a video about a woman who was rushed the hospital and made the staff sick. Theres a lot of videos calling her the toxic lady. His video refers to her by name, mentions that moniker doesnt match how positive and loved she was, and her prior medical issues that likely caused her desperation.

Favorites for me at least:

El Aguante by Calle 13 (Spanish language)

Getting Sodas by The World is a Beautiful Place

Brave Faces Everyone by Spanish Love Songs (this song is kind of depressing in a hopeful way though)

Watch some rom coms (movies like As Good As It Gets and anime like Kimi ni Todoke and Wotakoi), eat some good ice cream, and maybe go to emo night at a bar

When someone reminds me so thanks