Is everyone accounted for?
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This episode of Unexpected Elements explores the theme of counting and tracking populations—both human and non-human—through a mix of global news and deep science. Starting with India’s historic census, the show dives into the challenges of accurately measuring populations, especially in remote areas, and reveals that global population estimates may be significantly underestimated due to missed rural populations. The discussion then shifts to the elusive nature of extinction, highlighting how species can vanish from records without being truly extinct, a phenomenon known as 'species limbo' or the 'Lazarus effect.' The episode also examines the critical importance of studying African genomes, emphasizing that Africa's genetic diversity holds vital clues for global health and medicine, yet remains vastly underrepresented in scientific research. From musical roads in Mumbai that sparked public outcry to the surprising weight of the internet, the show takes listeners on a journey through science, ethics, and the hidden systems that shape our world. The episode closes with a playful yet profound reflection on how much we still don’t know—even about things we think we’ve counted.
Global population estimates may be off by as much as 53% due to undercounting rural and remote populations.
Extinction is incredibly hard to confirm—many species are in 'species limbo' and may reappear after decades.
Africa’s genetic diversity is crucial for understanding human health, yet African genomes represent only 2% of global genomic databases.
The internet weighs over 92 million tonnes, primarily due to undersea cables, cell towers, data centers, and home Wi-Fi devices.
Musical roads, while innovative, can cause noise pollution and disrupt communities, highlighting the need for better urban planning.
The Human Census and the Illusion of Numbers
“The official UN estimate for the global population is about 8.2 billion, but research published in 2025 by Aalto University in Finland found that the actual number could be much higher than this.”
The Elusive Nature of Extinction
“Absence of evidence isn't evidence of absence. Very true, yeah.”
Why African Genomes Matter for Everyone
“If we ignore the African genome, we're ignoring a hugely diverse gene pool basically.”
The Music That Drives People Mad
“It would drive you totally bananas. Yes, it would...”
Weighing the Internet: A Digital Census
“The internet weighs over 92 million tonnes, primarily due to undersea cables, cell towers, data centers, and home Wi-Fi devices.”
“If we ignore the African genome, we're ignoring a hugely diverse gene pool basically.”
“The official UN estimate for the global population is about 8.2 billion, but research published in 2025 by Aalto University in Finland found that the actual number could be much higher than this.”
“The internet weighs over 92 million tonnes, primarily due to undersea cables, cell towers, data centers, and home Wi-Fi devices.”
Host
Guests
India
place
Caroline Steele
person
Chavi Sachdev
person
Mumbai
place
Candice Bailey
person
BBC World Service
organization
Dr. Amboise Wonkum
person
Professor Tamsin Mather
person
Jai Ho
media
3 Million African Genome Project
organization
Putting science on the map
Unexpected Elements • 49m • 4/3/2026
The ribbiting science of frogs
Unexpected Elements • 49m • 4/17/2026
Chernobyl: 40 years later
Unexpected Elements • 49m • 4/24/2026
The soaring price of condoms
Unexpected Elements • 49m • 5/1/2026
100 years of Sir David Attenborough
Unexpected Elements • 49m • 5/8/2026
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