Overview of Science Friday with Alex Davies
This episode of Science Friday explores the strange, rigorous, and often surprisingly human world of test engineering—the hidden work behind products and systems that must survive real-world abuse. Guest Alex Davies, author of The Destroyer: And Other Tales from the Wild, Unseen World of Test Engineering, explains how engineers test everything from bear-resistant garbage cans and jet engines to bird-safe glass, lawnmowers, and child-resistant medicine bottles. The conversation highlights how safety standards are built through compromise, evidence, and sometimes surprisingly theatrical experiments.
Opening Segment
- The show opens with a call for listener stories about microdosing GLP-1 medications.
- Science Friday invites people to share:
- why they tried microdosing,
- how they got it,
- and what the experience was like.
Bears as Product Testers
How “problem bears” become testers
- Davies explains that the bears used in resistance testing are often “problem bears”—bears that have become accustomed to human food.
- The story of Kobuk the Destroyer illustrates this:
- Kobuk’s mother was a problem bear in Alaska.
- After a lethal conflict with a rancher, Kobuk and his sister Nikina were rescued.
- They were relocated to a grizzly bear sanctuary in Montana, where they became part of bear-resistant product testing.
What “bear resistant” means
- Davies stresses that companies and regulators avoid the term “bear-proof” because no product can be guaranteed to stop every bear.
- Instead, the standard is bear-resistant, meaning it can withstand a bear’s attempts under testing conditions.
How the test works
- A product such as a garbage can is filled with attractive bear foods like:
- fish,
- honey,
- dog treats.
- Bears are given one hour to try to get into it.
- What counts as effort is called bear contact time, including:
- pawing,
- biting,
- mauling,
- jumping,
- and the “CPR technique” where a bear pumps its paws on the object.
- If the product remains unopened after the hour, it can receive certification from the Interagency Grizzly Bear Committee.
Other Strange and Serious Tests
Jet engines vs. birds
- Bird strikes are a major threat to aircraft engines.
- The FAA’s testing standard includes:
- a volley of 16 small birds,
- 8 medium birds,
- and one four-pound bird.
- Because of reproducibility and logistics, the “bird” is often represented by a chicken launched from a compressed-air cannon at around 220 mph.
- Davies explains the tension between:
- similarity: making the test resemble real life,
- workability: making it repeatable and practical.
Bird-safe glass
- Around a billion birds in the U.S. die annually from colliding with glass.
- To reduce this, designers are developing glass with:
- dots,
- stripes,
- or UV markings visible to birds but not humans.
- Testing takes place in a bird tunnel in Maryland:
- birds are captured humanely,
- placed in a tunnel with clear glass and test glass,
- and researchers observe which direction they fly.
- Netting prevents injury, so the birds are not harmed.
How Safety Standards Are Made
No single genius sets the rules
- Davies emphasizes that safety standards are not handed down by one authority.
- They are usually the result of:
- research,
- negotiation,
- politics,
- economics,
- and public comment.
Lawn mower blade-stop example
- In the early days of the Consumer Product Safety Commission (CPSC), one major issue was lawnmower injuries.
- People would clear clogged grass with their hands and lose fingers to the blade.
- The solution was the dead-man’s stop: the blade must stop when the operator lets go.
- The debate was not whether to require it, but how quickly the blade should stop.
- The eventual standard—about three seconds—was a compromise between:
- safety advocates pushing for faster stopping,
- and manufacturers pushing for slower, more achievable requirements.
Child-resistant medicine bottles
- The familiar “childproof” bottle is also a compromise.
- Testing involves:
- a panel of children ages 3 to 5,
- and older adults, including people with arthritis or limited hand strength.
- The standard requires the bottle to keep out 85% of children while still being usable by adults.
- Davies notes the tension:
- make it too hard for kids and it may become too hard for seniors,
- make it too hard for adults and people may not reseal it properly.
Big Takeaway on Boeing and Test Engineering
- Asked whether the Boeing 737 MAX door blowout means test engineering has lost its power, Davies says:
- the field is still strong,
- but testing only works if decision-makers listen to test engineers.
- He frames failures like Boeing and the space shuttle O-ring disaster as examples of engineers warning about risks that were not adequately heeded.
- His main point: the golden age of testing may still be here, but not always the golden age of respecting the results.
Key Takeaways
- “Bear-proof” is usually a myth; bear-resistant is the practical goal.
- Safety testing often uses strange but carefully designed real-world simulations.
- Standards are built through compromise, not perfection.
- Good testing requires both scientific rigor and institutional willingness to act on the findings.
- The unseen world of test engineering shapes everyday life more than most people realize.