The Evolution of Teeth
In Our Time11 Apr 2019

The Evolution of Teeth

Melvyn Bragg and guests discuss theories about the origins of teeth in vertebrates, and what we can learn from sharks in particular and their ancestors. Great white sharks can produce up to 100,000 teeth in their lifetimes. For humans, it is closer to a mere 50 and most of those have to last from childhood. Looking back half a billion years, though, the ancestors of sharks and humans had no teeth in their mouths at all, nor jaws. They were armoured fish, sucking in their food. The theory is that either their tooth-like scales began to appear in mouths as teeth, or some of their taste buds became harder. If we knew more about that, and why sharks can regenerate their teeth, then we might learn how humans could grow new teeth in later lives.

With

Gareth Fraser Assistant Professor in Biology at the University of Florida

Zerina Johanson Merit Researcher in the Department of Earth Sciences at the Natural History Museum

and

Philip Donoghue Professor of Palaeobiology at the University of Bristol

Producer: Simon Tillotson

Avsnitt(1085)

The Mariana Trench

The Mariana Trench

Misha Glenny and guests discuss one of the wonders of the natural world. In 1875 in the western Pacific, the crew of HMS Challenger discovered the Mariana Trench which turned out to be deeper than Ev...

19 Feb 58min

On Liberty

On Liberty

Journalist, author and historian Misha Glenny presents his first edition of In Our Time, succeeding Melvyn Bragg who retired from this role last summer. Misha and his guests discuss the landmark work ...

12 Feb 49min

Welcoming Misha Glenny

Welcoming Misha Glenny

Misha Glenny introduces himself to you ahead of his first episode on 15th January, answering some questions from producer Simon Tillotson and sharing what's coming up in the first few weeks.In Our Tim...

5 Feb 6min

Melvyn Bragg meets Misha Glenny

Melvyn Bragg meets Misha Glenny

Before Misha Glenny's first edition on 15th January, BBC Radio 4's flagship news programme Today has brought Melvyn Bragg and Misha Glenny together so they can share their ideas about In Our Time's su...

22 Jan 16min

Civility

Civility

Melvyn Bragg and guests discuss the idea that Civility, in one of its meanings, is among the most valuable social virtues: the skill to discuss topics that really matter to you, with someone who disag...

31 Juli 202551min

Dragons

Dragons

Melvyn Bragg and guests explore dragons, literally and symbolically potent creatures that have appeared in many different guises in countries and cultures around the world. Sometimes compared to snake...

24 Juli 202546min

Barbour's 'Brus'

Barbour's 'Brus'

Melvyn Bragg and guests discuss John Barbour's epic poem The Brus, or Bruce, which he wrote c1375. The Brus is the earliest surviving poem in Older Scots and the only source of many of the stories of ...

17 Juli 202549min

The Evolution of Lungs

The Evolution of Lungs

Melvyn Bragg and guests discuss the evolution of lungs and of the first breaths, which can be traced back 400 million years to when animal life spread from rock pools and swamps onto land, as some fis...

10 Juli 202548min

Populärt inom Historia

kod-katastrof
massmordarpodden
historiska-brott
p3-historia
motiv
historiepodden-se
rss-historiska-brottslingar
olosta-mord
rss-historien-om
rss-seriemordarpodden
historianu-med-urban-lindstedt
krigshistoriepodden
rss-massmordarpodden
mannen-utan-spar
nu-blir-det-historia
obskyr-historia
bedragare
rss-folkets-historia
militarhistoriepodden
harrisons-dramatiska-historia