Laetoli Trackways Diagram

View a diagram of the hominid footprints that archaeologist Mary Leakey's team found at Laetoli in Tanzania.

Language Development

On his journey to discover the human spark, Alan Alda speaks with Dr. Elizabeth Spelke from Harvard University and Professor Neville from the University of Oregon about the development of language in this video from The Human Spark.

Accessibility features: Transcript

The Language Spark

This excerpt from the PBS series The Human Spark explores the human brain’s unique capacity for language.

Lava Landscapes

Learn how volcanic activity affects the surrounding land in this video from Nature.

Accessibility features: Transcript

Leafy Spurge

This video segment from Evolution: "Extinction!" shows how biological control is successfully combating North Dakota's infestation of leafy spurge, a non-native plant.

Accessibility features: Caption

Learning Right and Wrong

Through scientific research, this video from The Human Spark illustrates how a child’s views of what is right and wrong can be shaped by others.

Accessibility features: Transcript

Learning to be a Raccoon

This video resource from Nature: "Raccoon Nature" explores how raccoon kits learn from their mother.

Liberty Lands

In this What's Up In The Environment? video segment, learn how a contaminated plot of land in Philadelphia was recycled into a beautiful public park called Liberty Lands.

Accessibility features: Caption, Transcript

Life and Death of Salmon

This video adapted from Nature explores the life and death of wild salmon in the Pacific Northwest.

Accessibility features: Transcript

Life Cycle of a Seed Plant

In this interactive activity adapted from the University of Alberta, learn about each step in the life cycle of a seed plant.

Life in Florida's Spring

In this video segment from Nature, get a close up look at life in the warm Florida springs and the numerous predators supported by the abundant life.

Accessibility features: Transcript

Life in the Water Supply

Take a close look at life in one town’s water supply in this video segment from Nature.

Accessibility features: Transcript

Life of a Tree

In this interactive activity adapted from the National Arbor Day Foundation, take a sixty-two-year journey observing the inner layers, rings, and environmental factors that affect a tree's growth and life cycle.

Light Pollution

In this interactive activity adapted from the National Park Service, learn how light pollution affects the night sky, animals, and humans, and then explore several possible solutions.

Links in the Evolutionary Chain

In this segment, Alan Alda, host of The Human Spark, explores some of the characteristics that distinguish different branches of the hominid “family tree,” such as brain and face size, ability to make tools, and location..

Accessibility features: Transcript

Little Brain, Big Journey

This Nature video shows the migratory patterns and habits of the Rufous hummingbird.

Accessibility features: Transcript

Living and Nonliving

What is it that distinguishes a living organism from a nonliving object? This collection of images presents examples that aren't as clear-cut as one might think, enticing students to question the meaning of life.

The Living Fossil

In this video from Nature, learn about the horseshoe crab, a creature that has survived for 350 million years.

Accessibility features: Transcript

Living on the Coast

This video, adapted from material provided by the ECHO partners, illuminates how living on the coast affects individuals and communities, particularly humans' interrelationships with natural resources.

Accessibility features: Caption

Loading a Gel

This video produced by WGBH provides step-by-step instructions for loading samples into an agarose gel.

Accessibility features: Caption