Mark Rober's CrunchLabs Season 3, Episode 9: Engineers vs Custom Go Kart Racing

Lava vs Laser Destruction Test

What's the most destructive substance on Earth? Lava's the reigning champ - but how do lasers stack up? Mark and his friends are about to find out.

24 min

Backyard Squirrel 2.0 - Bank Heist

Mark ups his backyard obstacle course game to keep four thieving squirrels away from a bank vault full of birdseed and a lifetime supply of walnuts.

18 min

Building a Liquid Sand Hot Tub

With the right amount of forced air, a hot tub filled with sand can look like a bubbling pot of soup. But how? Mark breaks down the science behind it.

10 min

This Ball Is Impossible to Hit

Mark uses the magic of engineering to level the playing field in a stacked competition against the world's greatest wiffle ball players.

24 min

Vortex Cannon vs Drone

Mark explores the possibilities of anti-drone defense technologies with a crew of backyard YouTube engineers... and the world's largest vortex cannon.

22 min

Glitter Bomb 1.0 vs Porch Pirates

Stolen packages? Not so fast. Mark builds the original "Glitter Bomb" trap to combat porch pirates-and really make them regret their life choices.

9 min

Engineers vs Food Robots

From cereal and milk to spaghetti and meatballs: Things get messy when the CrunchLabs team cooks up new ways to make Mark's mealtimes more efficient.

14 min

Mark Rober vs Ninja Kidz

It's not just the Ninja Kidz - it's the whole Ninja Fam! And Mark's challenging them all to a silly series of "Minute to Win It" style challenges.

9 min

Episode 10