MythBusters · Video summary

What happens when fans pick the myths? | MythBusters | S4 E29 | Full Episode

MythBusters tests fan-submitted myths: can a plane take off on a treadmill, and can cockroaches survive a nuclear blast? They also explore a car-filling foam prank.

MythBusters · February 15, 2026 · 49-min episode · 6-min read

What happens when fans pick the myths? | MythBusters | S4 E29 | Full Episode

Key takeaways

🎯An airplane on a conveyor belt moving in the opposite direction of its intended travel can take off because the plane's thrust comes from its engines pushing air, not from its wheels interacting with the ground.21:30
🔍The perceived inability of a plane to take off on a conveyor belt stems from confusing how cars (ground-dependent thrust) and planes (air-dependent thrust) operate.21:30
🚀When considering systems with independent thrust (like airplanes or rockets), remember their propulsion is not directly dependent on the surface they are on.21:30
🚀A prank involving frozen shaving cream failing to fill a car led to a more extreme test using 25 gallons of expanding AB foam, which successfully filled and destroyed a car.39:02
🔧For extreme prank scenarios, consider the potential for highly reactive expanding foams, but be aware of the destructive and irreversible consequences.39:02
💡Cockroaches are more resilient to radiation than humans, but they are not the ultimate survivors; some flower beetles and fruit flies demonstrated greater resistance in high-dose radiation tests.41:44

Chapters

0:02🎯 Introduction to MythBusters Episode
1:56🎯 Initial Myth 소개: Plane on a Conveyor Belt
2:56🎯 Small-Scale Testing of Conveyor Belt Myth
9:43🎯 Testing the Cockroach Survival Myth
15:58🎯 Radiation Exposure Experiments
22:01🎯 Myth Bust: Airplane Thrust and Wheels
22:01🎯 Explanation of Thrust vs Wheels
22:51🎯 Full-Scale Conveyor Belt Test
32:44🎯 Full-Scale Flight Test with Conveyor Belt
41:50🎯 Results: Cockroaches and Radiation
42:32🎯 Conclusion on Cockroach Myth
46:10🎯 Results of Full-Scale Test
46:22🎯 Results of Full-Scale Flight Test

The digest

This episode puts highly debated fan-picked myths under the scientific microscope, tackling one of the most contentious internet debates—whether a plane can take off from a conveyor belt moving in the opposite direction at takeoff speed—as well as the popular idea that cockroaches survive nuclear radiation. The team also explores a viral prank myth involving frozen shaving cream expanding to fill a car. The experiments combine scale modeling, live insect irradiation, and a full-scale manned aircraft test, culminating in clear, evidence-based conclusions. This summary is essential for anyone interested in physics of flight, radiation biology, and myth debunking methodology.