And even though it went according to plan, YouTuber and former NASA engineer, Mark Rober, contested the achievement, saying that his own pool-sized elephant’s toothpaste was actually the largest.

Mark Rober is a former NASA engineer and a very popular YouTuber. He’s the same guy who, last year, built a “Ninja Warrior” course to stop squirrels from stealing his nuts. He’s also the ...

The dramatic experiment, known as the 'elephant's toothpaste' test, was carried out by YouTubers Nick Uhas and David Dobrik - who were re-creating a similar attempt by NASA engineer Mark Rober ...

Youtuber Mark Rober has made large scale elephant and Devil’s toothpaste demonstrations. The expanded volume seems to be hundreds of times the original volume of liquid. There have been graphics ...

Mark Rober, the former NASA engineer and YouTube wonder, signs with Netflix for a 2026 family competition series and brings his most memorable science experiments to the platform later this year.

“Wow! It’s really awesome,” posted another. “I love elephant toothpaste videos,” shared a third. There were many who mentioned Mark Rober in their comments.

In the clip above, Mark Rober teams up with "Science" Bob Pflugfelder and Guillermo to fill Kimmel's office with elephant toothpaste (basically expanding foam made using hydrogen peroxide), before ...