How Dangerous is a Penny Dropped From a Skyscraper?

Value of the Information & Strength of the Argument

The video provides high-value information by combining theoretical physics with hands-on experimentation. The argumentation is solid: it starts with a clear hypothesis, conducts controlled experiments (helicopter drops, wind tunnel), and uses quantitative data (terminal velocities, energy calculations) to support conclusions. The collaboration with Adam Savage adds practical expertise and engaging demonstration. The explanation of terminal velocity and the role of air resistance is clear and accessible, and the video effectively debunks the myth while providing broader context on projectile dangers.

Scientific Rigor, Source Quality, Title Accuracy

The video demonstrates strong scientific rigor. It references peer-reviewed literature (e.g., Villermaux & Bossa 2009 on raindrop fragmentation) and authoritative sources (NASA for the Apollo 15 hammer-feather drop, National Safety Council for injury statistics). The experimental methodology is transparent, and the video acknowledges limitations (e.g., helicopter downwash affecting penny trajectories). The title accurately reflects the content, and the video stays on-topic throughout. The inclusion of a sponsored segment (Brilliant) is clearly disclosed and does not detract from the scientific content.

The title accurately reflects the core question addressed, and the content thoroughly explores the danger of a falling penny, including experimental validation.

9/10

The video combines direct experimental testing (helicopter drops, wind tunnel demonstrations) with references to peer-reviewed studies (e.g., Villermaux & Bossa 2009) and authoritative sources (NASA, National Safety Council). The methodology is transparent and the conclusions are well-supported by quantitative analysis.

Markers derived by PSI from the transcript: the creator did not define chapters.

• 00:00Introduction: the myth of the lethal penny from the Empire State Building.
• 02:00Helicopter drop experiment: pennies dropped on Derek to test impact.
• 05:00Explanation of terminal velocity and the hammer-feather experiment on the Moon.
• 08:00Wind tunnel demonstration: penny's two terminal velocities and oscillation.
• 10:00Testing ballpoint pens: are they lethal? Using a ballistic gel dummy.
• 12:00Discussion of drag coefficient and why bullets are shaped as they are.
• 14:00Historical weapons: flechettes and Lazy Dogs, and their dangers.
• 16:00Statistics on deaths from falling objects and the energy threshold for skull fracture.
• 18:00Conclusion: pennies are not lethal, but heavier objects can be.
• 20:00Sponsored segment for Brilliant.

• Villermaux, E., & Bossa, B. (2009). Single-drop fragmentation determines size distribution of raindrops. Nature physics, 5(9), 697-702. — Referenced for the physics of raindrop fragmentation and terminal velocity.
• Altair. (2019). Digital Debunking: Could a Penny Dropped Off the Top of the Empire State Building Actually Kill You? — Referenced as a prior analysis of the penny myth.
• Braeunig, R.A. Atmosphere Properties. — Referenced for atmospheric density data used in terminal velocity calculations.
• The Guardian. (2014). Brutal winter weather brings new challenge: ice falling from skyscrapers — Referenced for the danger of falling ice from skyscrapers.
• NASA. (2018). The Apollo 15 Hammer-Feather Drop — Referenced for the demonstration of equal acceleration in vacuum.
• Red Bull Stratos — Referenced for Felix Baumgartner's supersonic freefall and terminal velocity.
• Quealy, K., Sanger-KatzIn, M. (2015). In Other Countries, You’re as Likely to Be Killed by a Falling Object as by a Gun. New York Times. — Referenced for statistics on deaths from falling objects.
• National Safety Council. (2022). Struck by Objects. — Referenced for statistics on deaths from struck-by-object incidents.
• Williams, A. (2019). What are your chances of being killed by hail in the US? — Referenced for hail-related injuries and fatalities.
• NewScientist. (2021). Can bullets fired upwards cause injuries when they return to earth? — Referenced for the dangers of celebratory gunfire.
• Chambers, J. (2020). Meet the Flechette – the Deadliest Weapon of World War I? — Referenced for historical use of flechettes.
• Wikipedia. Lazy Dog (bomb). — Referenced for the Lazy Dog kinetic projectiles.
• Gläser, N., Kneubuehl, B. P., Zuber, S., Axmann, S., Ketterer, T., Thali, M. J., & Bolliger, S. A. (2011). Biomechanical examination of blunt trauma due to baseball bat blows to the head. Journal of Forensic Biomechanics, 2 — Referenced for biomechanics of blunt trauma and skull fracture thresholds.
• Yoganandan, N., Pintar, F. A., SANCES JR, A. N. T. H. O. N. Y., Walsh, P. R., Ewing, C. L., Thomas, D. J., & Snyder, R. G. (1995). Biomechanics of skull fracture. Journal of neurotrauma, 12(4), 659-668. — Referenced for biomechanics of skull fracture.
• New York Times. (2014). Falling Tape Measure Kills Man at Jersey City Construction Site — Referenced for a fatal falling object incident.
• IMDb. (2006). "MythBusters" Bullets Fired Up (TV Episode). — Referenced for MythBusters episode on bullets fired upward.
• Adam Savage's video on Tested channel — Companion video on Adam Savage's channel about the wind tunnel.
• iFly STEM field trips — Referenced for wind tunnel experience and STEM education.
• Alistair McClymont's artwork 'Raindrop' — Referenced for the visual of raindrops.

• MythBusters episode on bullets fired up — MythBusters tested similar myths about falling objects and concluded they are not lethal.
• Altair. (2019). Digital Debunking: Could a Penny Dropped Off the Top of the Empire State Building Actually Kill You? — This analysis likely reaches a similar conclusion about the non-lethality of a penny.

• Common myth belief — The myth that a penny from a skyscraper is lethal is widely believed, but the video's experiments and calculations show it is not.

• brilliant.org