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Showing 1-37 of 37 Resources
  • How Lizards Find Their Way Home

    How Lizards Find Their Way Home

    Scientists at Work

    (8 min 33 sec) When Dr. Manuel Leal removed lizards from an area in the forest, he noticed an interesting phenomenon: all the lizards seemed to be back the next day. Watch as he sets up an experiment to study how these lizards navigate home. Also available in Spanish.

  • Studying Elephant Communication

    Studying Elephant Communication

    Scientists at Work

    (6 min 43 sec) Elephants can communicate over long distances using low-frequency sounds that travel both in the air and through the ground. Scientists are studying whether elephants can “hear” and interpret these ground vibrations.

  • Holiday Lecture 2004 Update—Jeff Friedman

    Holiday Lecture 2004 Update—Jeff Friedman

    Clip

    (3 min 52 sec) HHMI investigator Jeff Friedman provides an update to his 2004 lectures on obesity.

  • Comparing Human and Chimpanzee Tool Use

    Comparing Human and Chimpanzee Tool Use

    Clip

    (29 sec) Chimpanzees are capable of using rocks as tools to crack nuts for eating. But they don't appear to use sharp-edged tools.

  • Dung Beetles and their Fossilized Evidence

    Dung Beetles and their Fossilized Evidence

    Clip

    (39 sec) Fossilized dung beetle balls are part of a comprehensive fossil collection project to reconstruct the habitat of Ardipithecus ramidus.

  • The Mosquito Life Cycle

    The Mosquito Life Cycle

    Clip

    (1 min 7 sec) To prevent mosquitoes from spreading diseases, it's essential to understand their life cycle.

  • Q&A on Cone Snails

    Q&A on Cone Snails

    Lecture

    (9 min 18 sec) In this ten-minute Q&A session, Dr. Olivera answers questions on cone snail behavior, venoms, and biodiversity.

  • From Venoms to Drugs

    From Venoms to Drugs

    Lecture

    (58 min 29 sec) Venomous carniverous cone snails are a rich source of molecules for scientific research and potential drug development.

  • Cone Snails: Versatile Hunters

    Cone Snails: Versatile Hunters

    Clip

    (13 min 39 sec) Dr. Jason Biggs of the University of Guam Marine Laboratory discusses the anatomy of cone snails and introduces us to a variety of cone snail species with different tactics to hunt and capture their prey.

  • Conus tulipa hunts fish by net

    Conus tulipa hunts fish by net

    Clip

    (1 min 7 sec) Unlike a hook-and-line type fish-hunter, a net-hunting cone snail lures its prey into its wide mouth.

  • Conus textile strikes a snail

    Conus textile strikes a snail

    Clip

    (44 sec) A snail-hunting species of cone snail stings its prey repeatedly, inducing the prey to thrash about.

  • Conus striatus strikes a fish

    Conus striatus strikes a fish

    Clip

    (44 sec) A species of fish-hunting cone snail quickly immobilizes its prey and swallows it.

  • Conus imperialis strikes a worm

    Conus imperialis strikes a worm

    Clip

    (31 sec) A worm-hunting cone snail species feeds on fireworms, and is unaffected by the prey's sharp bristles.

  • Conus catus strikes a fish

    Conus catus strikes a fish

    Clip

    (1 min 11 sec) A fish-hunting cone snail strikes its prey with a venomous harpoon, causes paralysis, and eats it.

  • Conus bullatus "lightning strike"

    Conus bullatus "lightning strike"

    Clip

    (1 min 10 sec) This species of cone snail immobilizes its prey in a split second with lightning-strike cabal toxins.

  • Bobtail squid swimming and burrowing

    Bobtail squid swimming and burrowing

    Clip

    (1 min 3 sec) The bobtail squid swims during the night to hunt. During the day, it burrows to hide from predators.

  • Memories are Made of This

    Memories are Made of This

    Lecture

    (58 min 29 sec) The cellular and molecular nature of learning and memory, investigated in simpler sea slugs and more-complex mice. Molecular basis of Alzheimer's disease.

  • Plan of Action: How the Spinal Cord Controls Movement

    Plan of Action: How the Spinal Cord Controls Movement

    Lecture

    (58 min 29 sec) Understanding the neural circuits in the spinal cord that control movement.

  • Mapping Memory in the Brain

    Mapping Memory in the Brain

    Lecture

    (58 min 29 sec) The history of localization of function in the brain, and research that led to the understanding of localization of memory.

  • Making Your Mind: Molecules, Motion, and Memory

    Making Your Mind: Molecules, Motion, and Memory

    Lecture

    What is mind? Can molecular biology help us understand mental function?

  • Clive Wearing: A man without memory

    Clive Wearing: A man without memory

    Clip

    Clive Wearing has lost his ability to remember and lives in a perpetual state of having just awoken.

  • Waterman touching thumb to fingers without feedback

    Waterman touching thumb to fingers without feedback

    Clip

    (1 min 15 sec) In the absence of proprioception and visual feedback, it is impossible to touch thumb to fingers accurately.

  • Walking versus hopping

    Walking versus hopping

    Clip

    (1 min 12 sec) In a giraffe's walk, left and right limbs move alternately, while in a kangaroo's hop, opposing limbs move together.

  • Visualizing learning

    Visualizing learning

    Clip

    (5 min 39 sec) Dr. Harshad Vishwasrao guides you through a collection of images showing neuronal growth and synaptic formation representative of anatomical changes that occur during learning.

  • Demo: Using spatial memory to clear an obstacle

    Demo: Using spatial memory to clear an obstacle

    Clip

    (2 min 9 sec) Even without visual feedback, we are able to negotiate an obstacle using spatial memory.

  • Behavior of mice that lack proprioception

    Behavior of mice that lack proprioception

    Clip

    (24 sec) Genetically engineered mice lacking proprioceptive sensory axons are not capable of well-coordinated walking.

  • Demo: Proprioception makes raising a mug easy

    Demo: Proprioception makes raising a mug easy

    Clip

    (52 sec) The average person has no difficulty raising a coffee mug.

  • Mutant mice with crossed excitation hop

    Mutant mice with crossed excitation hop

    Clip

    (1 min 18 sec) Kangaroo-like hopping when spinal cord excitatory interneurons cross the midline to stimulate both sides.

  • Mice navigate a Barnes maze to test spatial learning

    Mice navigate a Barnes maze to test spatial learning

    Clip

    (2 min 15 sec) Mice can be trained to use spatial cues to navigate a maze that tests their ability to remember specific locations.

  • Muscle activity during walking and hopping

    Muscle activity during walking and hopping

    Clip

    (45 sec) Electrical activity recorded from the leg muscles reveals different patterns of activation during different gaits.

  • Ian Waterman: Compensating for proprioceptive loss

    Ian Waterman: Compensating for proprioceptive loss

    Clip

    (1 min 41 sec) In the absence of proprioceptive feedback, some individuals can compensate by using visual feedback.

  • Computer analysis of human movement

    Computer analysis of human movement

    Clip

    (56 sec) Dr. Jessell's leg muscle activation patterns are recorded during walking.

  • Cat remembers obstacle location for many minutes

    Cat remembers obstacle location for many minutes

    Clip

    (1 min 38 sec) Even when distracted by food, the cat's brain encodes and retains the location of an obstacle.

  • Aplysia's gill-withdrawal reflex and sensitization

    Aplysia's gill-withdrawal reflex and sensitization

    Clip

    (1 min 25 sec) A touch to the Aplysia's siphon causes a gill withdrawal, a simple reflex for studying memory.

  • Fruit Fly Courtship

    Fruit Fly Courtship

    Clip

    (55 sec) Male courtship dances in two fruit fly species show that the wing spots play a prominent role.

  • The Science of Fat

    The Science of Fat

    Lecture

    In the 2004 Holiday Lectures on Science, HHMI investigators Ronald M. Evans and Jeffrey M. Friedman discuss how the body regulates weight by carefully controlling the storage and burning of fat—and how a better understanding of these complex metabolic systems could lead researchers to treatments that curb obesity and improve public health. Awards 2006 Telly Awards; Silver

  • Clockwork Genes: Discoveries in Biological Time

    Clockwork Genes: Discoveries in Biological Time

    Lecture

    Four lectures highlight the research of two scientists who have made groundbreaking discoveries elucidating the molecular basis of circadian clocks—the internal timekeepers that govern fluctuations in behavior and physiology on a 24-hour cycle.

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