It was almost impossible to make the blue LED [video](youtube.com)300 points by keepamovin 2 years ago | 156 comments
Veritasium: Light bulbs are linked to the invention of computer(youtube.com)34 points by h1fra 3 years ago | 10 comments
The surprising genius of sewing machines [video](youtube.com)163 points by gumby 2 years ago | 54 comments
How the Most Expensive Swords in the World Are Made(youtube.com)10 points by bookofjoe 2 years ago | 6 comments
Not paying electricity for an entire year with Tesla Solar Roof [video](youtube.com)33 points by teleforce 3 years ago | 32 comments
![Screenshot of youtube.com: It was almost impossible to make the blue LED [video]](https://hn.urlbox.com/shots/renders/2024/2/9/c2aca7fc-799e-418b-ae6a-ab93f4b4eb12.jpg)
![Screenshot of youtube.com: Knot theory [video]](https://hn.urlbox.com/shots/renders/2023/9/24/2c668d03-8b90-4f21-ad28-97020beb36ed.jpg)
![Screenshot of youtube.com: The surprising genius of sewing machines [video]](https://hn.urlbox.com/shots/renders/2023/12/29/9f20a471-913a-4775-8a57-367376c53527.jpg)
![Screenshot of youtube.com: Not paying electricity for an entire year with Tesla Solar Roof [video]](https://hn.urlbox.com/shots/renders/2023/7/29/5ccffa88-6517-4a3a-a91b-a078dbd9b6b2.jpg)