ALT A mockup of a phone showing the YouTube app interface.

ALT Lilly Singh holds up a production slate reading "Lilly's First Day Back at YouTube" with graphic text overlay reading "Lilly Singh is Returning to Sketch Comedy on YouTube. New video marks a return to form for the OG creator."

ALT On YouTube, there are no gatekeepers demanding I make my brain baby more palatable for the masses. That authenticity is why my channel worked in the first place.

ALT Mark Rober leaning over a wooden science demonstration alongside a student. A blue text box reads: "The most important project of Mark Rober’s career. Inside the new CrunchLabs & YouTube initiative bringing creator-led science to schools worldwide." Below is the YouTube and Google.org logo.

ALT Mark Rober wearing safety goggles and lighting a small flame on an experiment setup labeled with "WOOD" and "METAL." Below is a quote: "'I was at a coworker’s house and I asked his daughter what she’s learning in science. She showed me an old Bill Nye video and a worksheet that looked like it had been copied a thousand times. This generation grew up on YouTube, but classroom science hasn't evolved.' — Mark Rober."

ALT Enter Class CrunchLabs, a free science curriculum for Grades 6-8 designed to spark student curiosity. More than 1,000 videos. Available in 34 languages. Standards-aligned curriculum. Built in partnership with YouTube & the National Science Teaching Association

ALT Mark Rober stands in a carnival-themed studio reacting with open hands as a basketball rolls down a ramp toward a student wearing a fake mustache. The quote box reads: "'For the next four and a half years, one week out of my month is volunteering to make videos for Class CrunchLabs. It’s a massive undertaking and a huge labor of love, but it will be the most important thing I do in my whole career.' — Mark Rober."