For the latest episode of Howtown, Adam Cole and Joss Fong look at wildfires and how investigators go about determining and proving how they start. The backdrop of video is the investigation into the Palisades Fire and the related arson trial that just concluded.
What started the Palisades Fire, and why did the LA arson trial fall apart? This Howtown episode investigates the deadly Pacific Palisades wildfire, the smaller New Year’s Eve Lachman Fire, and the federal arson case against Jonathan Rinderknecht. Prosecutors argued that the Lachman Fire became a hidden holdover fire, smoldering in roots and dense vegetation before reigniting during Santa Ana winds and becoming the catastrophic Palisades Fire. We examine how ATF fire investigators determine fire origin and cause using wildfire forensics, burn patterns, fire behavior, wind direction, topography, fuel, surveillance camera footage, ALERTCalifornia cameras, cell phone location data, ignition source testing, and lab experiments.
The episode also looks at competing theories in the Palisades Fire investigation, including fireworks, cigarette ignition, open flame, accidental fire, intentional arson, smoldering roots, and reignition. At trial, prosecutors pointed to Rinderknecht’s location, behavior, searches, messages, 911 calls, and alleged motive, while the defense argued there was no direct evidence, no smoking gun, no recovered ignition source, and serious uncertainty in the wildfire investigation. The LA arson trial ended with a deadlocked jury, a mistrial, and a 10–2 split, raising questions about reasonable doubt, negative corpus, forensic science, ATF methods, LAFD response, the Skull Rock trailhead, the Lachman Fire origin, and why proving wildfire arson is so difficult after the evidence has burned away.
In the most recent episode of Howtown, Joss Fong explains how above-ground nuclear testing in the 50s and 60s left a signature in all life on Earth that can be used as a forensic tool for catching art forgers, shady ivory dealers, and even fraudulent wine sellers/cellars.
In the 1950s and early 1960s, the United States and the Soviet Union (with contributions from the UK and France) conducted a series of above-ground nuclear tests that led to an increase in the radioactive carbon-14 concentration in the atmosphere. This global surge, known as the “bomb pulse” or the “bomb spike”, is one of the most distinctive chemical signatures of the Cold War. The radiocarbon spread worldwide, embedding into plants, animals, and humans.
Scientists later discovered that this bomb-pulse radiocarbon spike could be used as a precise dating tool. Bomb-pulse dating allows researchers to determine whether biological material formed before or after nuclear testing. This method has been applied to forensic science, medical research, and environmental monitoring. It has been used to identify forgeries in artwork, measure human cell turnover, and estimate the lifespan of Greenland sharks.
One of the most important applications has been in tracking the illegal ivory trade. Elephant tusks absorb atmospheric carbon while the animal is alive. By analyzing the carbon-14 content of ivory artifacts or raw ivory, investigators can determine whether the material comes from a legally antique source or from a recently killed elephant.
This intersection of nuclear history, atmospheric science, and conservation biology demonstrates how Cold War nuclear fallout became a forensic tool for fighting elephant poaching and wildlife trafficking. More broadly, it demonstrates the creativity and resourcefulness of scientific researchers, who find ingenious uses for datasets of unlikely origin.
The team at Howtown closed out 2024 by investigating the spice level (i.e. the Scoville ratings) of the lineup of hot sauces on the popular YouTube interview series Hot Ones while also teaching us about how hot peppers evolved and how pepper spininess is measured. (Spoiler: the sauces are not as hot as advertised.)
Cheers to Adam Cole for Peter Pipering this particular passage:
By picking peppers, they could pinpoint the precise percentage of each patch that was pungent, and some patches were more pungent than others.
Perfect.
The Howtown crew explains how food manufacturers, the USDA, and food label services figure out how many calories are in the foods we eat. Spoiler: it’s not just a matter of burning food to see how much energy is produced — different nutrients are absorbed more or less efficiently by the body so you need to measure the output and compare it to the input.
And don’t forget to check the comments for Joss Fong’s banana oat blobs.
How do we know how dogs see? Are they colorblind? Nearsighted? How do they perceive movement? Does their excellent sense of smell help dogs see? The first episode of Howtown from Adam Cole & Joss Fong is all about dog vision and is predictably fascinating.
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