Why did Google use brain teasers like the blender question?

Google used brain teasers like the blender question to screen a massive number of applicants, aiming to identify creativity, problem-solving skills, and communication abilities rather than just knowledge.

Can a person shrunk to the size of a nickel actually jump out of a blender?

Physically, yes. Due to the scaling of strength to weight, a nickel-sized human would have a significantly higher strength-to-weight ratio, enabling them to jump much higher relative to their body size, potentially clearing the blender walls.

What are the physics behind smaller animals being able to jump higher?

Smaller animals have a higher strength-to-weight ratio because strength scales with the cross-sectional area of muscles (square of height), while weight scales with volume (cube of height). This means weight decreases faster than strength as size reduces.

What factors might prevent a shrunken person from jumping out of a blender?

Biologically, a shrunken person might not survive long enough to jump. Their heart might not pump blood effectively, lungs might struggle with air pressure, and brain structures might not function at that scale, leading to death before a jump.

What did Google learn about using brain teasers in interviews?

Google found that brain teasers like the blender question were a 'complete waste of time' as they did not reliably predict job performance and primarily served to make interviewers feel smart.

If brain teasers don't predict job success, why are they useful?

While not useful for hiring, brain teasers encourage creative thinking and seeing the world from new perspectives, which is essential for scientific discovery, problem-solving, and learning to embrace the ridiculous to find profound answers.

Key Moments

The Blender Question Everyone Gets Wrong

Veritasium

Education3 min read21 min video

Feb 18, 2025|9,490,597 views|222,946|22,306

veritasium science physics Veritasium engineering jumping muscle blender shrunk google interview question MIT insects

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Key Moments

TL;DR

Jumping from a blender is possible due to physics, but biological limitations make survival unlikely.

Key Insights

The classic Google interview "blender question" involves being shrunk to nickel size and escaping a blender in 60 seconds.

Initial intuitive answers focus on physical escapes like climbing or tying clothes, but these are often insufficient.

Physics dictates that smaller animals have a higher strength-to-weight ratio, enabling them to jump significantly higher relative to their size.

While physically capable of jumping out, human biology at a nickel size faces insurmountable challenges like insufficient blood circulation and respiration.

Google no longer uses such brain teasers, recognizing they are poor predictors of job performance and primarily serve to make interviewers feel intelligent.

These 'silly' questions are valuable for sparking curiosity, encouraging creative problem-solving, and illustrating new scientific concepts.

THE GOOGLE BLENDER BRAIN TEASER

The video explores a famous Google interview question where a person is shrunk to the size of a nickel and has 60 seconds to escape a blender before the blades start. This question, along with others like 'how many golf balls fit in a 747,' was used by Google in its early days to screen millions of applicants, given its extremely low hiring rate. The goal was to assess candidates' problem-solving and creative thinking skills through these brain teasers.

INITIAL INTUITIVE ESCAPE ATTEMPTS

When presented with the blender scenario, common initial reactions involve attempting to physically escape by ducking, breaking the blender, climbing the walls, or using clothing as a rope. Some suggest aiming for the center where blade rotation might be less impactful. These ideas, while creative, often overlook the fundamental physics and biology involved when scaling down to such a small size.

THE PHYSICS OF SMALL STRIDES

A key insight from biomechanics, notably observed by Alfonso Borelli, is that smaller animals can jump significantly higher relative to their body size. This is because strength is proportional to muscle cross-sectional area (scaling with the square of height), while weight is proportional to volume (scaling with the cube of height). Consequently, smaller creatures have a much higher strength-to-weight ratio, allowing them to generate proportionally more force for jumping.

JUMPING OUT: THE PHYSICAL FEASIBILITY

Based on physics, a person shrunk to nickel size would indeed possess the relative strength to jump high enough to clear the blender walls. Simulations suggest a jump height exceeding the required 30 cm for a 2 cm tall individual. Even accounting for air resistance and potential uncoordinated movements, a vertical jump remains a plausible physical escape mechanism from the blender itself.

BIOLOGICAL LIMITATIONS: THE REAL KILLER

Despite the physical ability to jump, the human body at a nickel scale faces critical biological challenges. The heart would be unable to pump blood effectively to the brain, lung function would be compromised due to the inability to control air pressure, and cellular structures would not scale down properly. These fundamental biological failures would likely result in death before any escape attempt could even be initiated.

THE DECLINE OF BRAIN TEASERS

Google, recognizing the limitations of brain teasers, has largely abandoned them. Senior executives like Laszlo Bock have stated they are a 'complete waste of time' and do not predict job success. The questions often served more to make the interviewer feel smart rather than to genuinely assess a candidate's capabilities in areas like addressing ambiguity, problem decomposition, creativity, intelligence, and communication.

THE VALUE OF SILLY QUESTIONS

Although ineffective for hiring, 'silly' questions like the blender paradox hold significant educational and inspirational value. They compel people from all disciplines to view problems from new perspectives, encouraging creative thought and deeper exploration. This type of thinking, exemplified by Einstein's thought experiments and the origins of graph theory, is crucial for scientific discovery and understanding complex phenomena.

EMBRACING THE RIDICULOUS FOR LEARNING

The blender question, despite its perceived silliness, serves as a powerful illustration of how embracing the absurd can lead to profound insights. It highlights the interplay between physics and biology and demonstrates that sometimes, the most challenging problems require us to suspend disbelief and explore unconventional solutions. This willingness to entertain the ridiculous is a cornerstone of innovation and learning.

Mentioned in This Episode

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●People Referenced

Navigating the Blender Riddle: Dos and Don'ts

Practical takeaways from this episode

Do This

Focus on the physics and biomechanics of being small and strong.

Consider the strength-to-weight ratio advantage of smaller creatures.

Acknowledge the potential for increased jump height relative to body size.

Break down the problem into discrete components (height, jump ability, air resistance).

Embrace the ridiculous to find profound insights.

Use thought experiments to explore possibilities.

Avoid This

Try to hide under the blades without a plan for escape.

Rely solely on clinging to walls if your physiology isn't adapted.

Assume standard human physics apply without scaling considerations.

Overthink simple solutions by invoking concepts like quantum tunneling.

Attempt complex maneuvers like backflips or showing off.

Get bogged down in biological limitations before exploring physical possibilities.

Believe that only the correct answer matters in a brain teaser.

Jump Height Scaling Comparison

Data extracted from this episode

Scenario	Jump Height	Notes
Human scaled to 1% size (no drag)	42 cm	Based on 84kg person with 27cm jump height scaled down.
Human scaled to 1% size (with drag)	39 cm	Slight decrease due to air resistance.
Human scaled to 1% size (uncoordinated/sideways jump)	22 cm	Significantly reduced jump height due to increased air resistance.

Common Questions

The question poses that you are shrunk to the size of a nickel and placed in a blender with blades that will start spinning in 60 seconds. You must then describe what you would do to survive.