What Really Killed the Dinosaurs?

Until recently most scientists thought they knew what killed off the dinosaurs. A 10km-wide meteorite had smashed into the Yucatan peninsula in Mexico, causing worldwide forest fires, tsunamis several kilometres high, and an 'impact winter' - in which dust blocked out the sun for months or years. It was thought that the dinosaurs were blasted, roasted and frozen to death, in that order. But now a small but vociferous group of scientists believes there is increasing evidence that this 'impact' theory could be wrong. That suggestion has generated one of the bitterest scientific rows of recent times.

Other episodes for this season

The Demonic Ape
Episode 1 - The Demonic Ape
The Moscow Theatre Siege
Episode 2 - The Moscow Theatre Siege
The Atkins Diet
Episode 3 - The Atkins Diet
Secrets of the Star Disc
Episode 4 - Secrets of the Star Disc
The Dark Secret of Hendrik Schön
Episode 5 - The Dark Secret of Hendri...
Thalidomide - A Second Chance?
Episode 6 - Thalidomide - A Second Ch...
Diamond Labs
Episode 7 - Diamond Labs
T-Rex - Warrior or Wimp?
Episode 8 - T-Rex - Warrior or Wimp?
Project Poltergeist
Episode 9 - Project Poltergeist
The Truth of Troy
Episode 10 - The Truth of Troy
The Truth About Vitamins
Episode 11 - The Truth About Vitamins
King Solomon's Tablet of Stone
Episode 12 - King Solomon's Tablet of...
Derek Tastes of Earwax
Episode 13 - Derek Tastes of Earwax
What Really Killed the Dinosaurs?
Episode 14 - What Really Killed the Dinosaurs?
Making Millions the Easy Way
Episode 15 - Making Millions the Easy...
Saturn - Lord of the Rings
Episode 16 - Saturn - Lord of the Ring...
The Hunt for the Supertwister
Episode 17 - The Hunt for the Supertwi...
Dr Money and the Boy with No Penis
Episode 18 - Dr Money and the Boy with...