Size

Season 1Episode 860 minSep 21, 2008
Size
Life has evolved into a multitude of sizes. Over the course of three billion years, life has taken on many forms--from an .02-micrometer-long bacteria to the 110-foot-long blue whale. Scientists are learning how the struggle for survival has led some animals to become small and others to get huge. Understanding the evolution of size tells us why giant dinosaurs went extinct while the first tiny mammals thrived; gives us answers to why mammoths evolved into pygmies when restricted to islands; and why carnivorous mammals have never grown to weigh more than a ton. Whether it's the speed of movement or population numbers, the biological world revolves--and "evolves"--around size.
Size has aired on Sep 21, 2008 at 7:00 PM
Previous EpisodeNext Episode

Trailer

We do not have any trailers for this episode

Recently Updated Shows

Recently updated shows that might be of your interest.
The Creep Tapes
Running

The Creep Tapes

Based on a collection of videotapes in the secret vault of the world's deadliest and most socially uncomfortable serial killer, who hires his victims to film him for the day under false pretenses, each episode exposes a new victim from one of the fabled 'Creep Tapes'.

GenreHorror
America's Funniest Home Videos
Running

America's Funniest Home Videos

ABC's longest-running primetime entertainment show, America's Funniest Home Videos, returns for season 36 this fall with the same mission -- giving families something genuinely funny to enjoy together on Sunday nights.

"AFV," the longest-running primetime entertainment show in ABC history, returns for season 36 with the same mission - to provide viewers with hysterical moments that fly by at a dizzying pace.

The Real Housewives of Potomac
Running

The Real Housewives of Potomac

Just up the river from our nation's capital lies a hidden gem—Potomac, Maryland. Its rolling hills, gated mansions, sophisticated prep schools, and exclusive country clubs all serve to keep the area invitation-only. Sprinkled throughout this community are a handful of old-line, wealthy African-American families who have historically broken racial barriers to provide a life of privilege for their children. The Real Housewives of Potomac follows the upscale lives of six intriguing, well-to-do women: Gizelle Bryant, Katie Rost, Karen Huger, Charrisse Jackson-Jordan, Robyn Dixon, and Ashley Darby, all of whom have fought for their places in this society by way of legacy or marriage. In a town where entry is granted only through class, pedigree, and lineage, how far will these ladies go to secure their spot at the top of this prestigious circle?

The Traitors Canada
Running

The Traitors Canada

Follow a group of contestants – including some familiar faces – who live together as they complete a series of challenges with the goal of earning a cash prize. The catch? Some of the contestants are traitors who will attempt to deceive and manipulate their way to the prize instead of sharing it amongst the group. In this psychological adventure will the traitors be unmasked in time?

Homestead: The Series
Running

Homestead: The Series

A continuation of the movie Homestead... Amid chaos, ex-Green Beret joins prepper compound; love grows, truths arise, and a community unites.