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THE PHYSICAL EDITION

Feathers and Zips

A feather for a drawing takes Vince from a little gap to a whole bird. Follow his gentle stroke, compare firm and fluffy parts, and watch a pigeon care for its feathered wings.

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Explore the science

Looking closelyPages 1–2

Vince receives a feather in a shallow tray while his open notebook waits on the table. A single body feather can have both a firm vane and a fluffy base.

Ask together: What can Vince look closely at before he draws?

A branching surfacePages 3–4

A gentle finger movement parts a small patch in the feather’s firm surface. Neighbouring branches can separate while the shaft and branches stay whole.

Ask together: What has come apart?

Reconnecting an intact vanePages 5–6

Vince gently strokes the feather; the separated patch joins again. Tiny interlocking structures can reconnect when gently aligned, if they are intact. This does not mend a broken shaft or replace missing material.

Ask together: Where is the gap after the stroke?

Different feather structuresPages 7–8

Vince smooths the loose base, then lifts his fingers; it stays fluffy. This loose structure differs from the firm vane. Pressing it does not turn it into the same joined sheet.

Ask together: Which part stays fluffy?

PreeningPages 9–10

Vince watches a pigeon touch its wing feathers with its bill. Preening helps birds arrange and care for feathers, including realigning interlocking parts.

Ask together: How is the bird’s action like Vince’s?

A feathered wingPages 11–12

A stretching wing reveals rows of overlapping feathers. Long wing feathers overlap as parts of an attached, moving wing.

Ask together: Where do the feathers overlap?

Noticing a coveringPages 13–14

Vince closes his coat while the pigeon raises its body feathers. Loose feathers hold air near the body and slow heat loss. Fluffing can thicken insulation, but a puffed outline alone does not tell us why a bird fluffs.

Ask together: How do Vince and the bird change their coverings?

The whole bird in flightPages 15–16

The pigeon leaves the fence with its feathered wings spread, and Vince waves. Feathers form part of the flight surface; the bird’s whole moving wing and body take part.

Ask together: What can Vince see now that the wings are spread?

Sources and evidence

  1. A contour feather’s firm vane consists of many branches from a central shaft; adjoining branches can separate without the shaft breaking.

    Composition and Structure — AMNH Science Conservation

    How Feathers Are Built — Cornell Lab Bird Academy

    The picture shows visible branches and gaps. The tiny interlocking structures are too small to see without magnification.

  2. Gently aligning separated parts of an intact firm feather vane can reconnect its tiny interlocking structures. This does not mend a broken shaft or regrow lost material.

    Feathers: better than Velcro? — UC San Diego Jacobs School

    How Feathers Are Built — Cornell Lab Bird Academy

    Keeping Backyard Poultry — Minnesota Department of Health

    Rejoining requires intact structures; damaged or processed feathers may not reconnect.

    Use a specimen prepared for children’s handling, supplied by an adult. Do not use raw flock feathers. Keep away from mouths and wash hands with soap and water afterward. Looking at the pictures is an alternative.

  3. The loose fluffy basal portion of the selected contour feather does not form the same joined flat sheet when smoothed.

    Composition and Structure — AMNH Science Conservation

    How Feathers Are Built — Cornell Lab Bird Academy

    Loose basal branches may be pressed down temporarily; they do not become the same joined firm vane. Fluff is not simply damage.

  4. Birds use their bills to arrange and maintain feathers, including realigning the interlocking parts of firm vanes.

    Preening, sunbathing, dustbathing and waterbathing — BTO

    How Feathers Are Built — Cornell Lab Bird Academy

    Preening includes several kinds of feather care; a bill touching a feather does not show microscopic connections moving. Watch wild birds from a distance.

  5. Long overlapping wing feathers spread with a bird’s wing and help form a flight surface. A bird flies using its whole wing and body, not loose feathers alone.

    How Bird Feathers Work — Natural History Museum of Los Angeles County

    How flight feathers stick together to form a continuous morphing wing — Matloff et al., Science 367,293–297 (2020)

    The feathered wing and whole body act together. A detached feather is not a complete flying wing.

  6. Loose feather structure retains air near a bird’s body; fluffing can increase insulation and reduce heat loss. Feathers do not create heat.

    How Feathers Are Built — Cornell Lab Bird Academy

    How do birds keep warm in the winter? — U.S. Fish & Wildlife Service

    Feathers slow heat loss rather than make heat. Birds fluff in several contexts, so a puffed outline alone does not establish cold.

Water and Wind

Water and Wind, pages 1–2: Wind moves the pinwheel.

Spread 1 / 12

Wind tickles my cheek. Round goes my pinwheel.

Explore the science

Wind & forcesPages 1–2

Wind moves the pinwheel. Wind is moving air. Vince feels it on his cheek and sees it push the pinwheel's angled blades.

Ask together: What tells you that the air is moving?

Currents & eddiesPages 3–4

Water passes the rock. A leaf circles behind it. Most water passes the rock; some circles back in an eddy. Laminar flow is orderly; turbulence is irregular, mixing motion. A swirl alone cannot distinguish them.

Ask together: How does the leaf move compared with the water passing the rock?

Waves & energyPages 5–6

Waves spread from the stream. The duck bobs. The falling stream makes waves that carry energy outward and make the toys bob. The stream's current also carries toys along. Bobbing and drifting are different motions.

Ask together: What moves up and down? What moves along the pond?

BuoyancyPages 7–8

A duck floats. A pebble sinks. Water pushes upward on both objects. This buoyancy balances the duck's weight, but not the pebble's. The pebble's splash makes the rings on the next spread.

Ask together: Where is each object compared with the surface?

When waves meetPages 9–10

Two wave patterns approach one another. When gentle waves overlap, their heights add, briefly raising or lowering the surface. This interference does not erase the waves; they continue through one another.

Ask together: What might happen where the two patterns meet?

Surface tensionPages 11–12

Tiny dents appear beneath the strider’s legs. Surface tension helps support the strider where its water-repellent legs dent the water. The duck floats mainly by displacing water.

Ask together: What do you notice where its legs meet the water?

Suction & pressurePages 13–14

The duck bubbles, fills and squirts. Squeeze underwater: air bubbles out. Release with the opening submerged: the elastic duck springs back, lowering pressure inside. The surrounding water pressure pushes water in. Squeeze above water: water exits through that same opening.

Ask together: What changes when Vince squeezes and then lets go?

Lift & gravityPages 15–16

A paper plane glides forward and down. The throw starts the plane moving. Airflow around its wings produces lift and turns air downward. Gravity pulls down; drag resists motion. In still air, the plane glides forward and gradually descends.

Ask together: Where might the plane go next?

ViscosityPages 17–18

Milk runs. Honey stretches into a thread. Honey's greater viscosity means greater resistance to flow. It makes a slow thread while milk runs readily. Temperature and pouring method also matter; this snack is an observation, not a controlled test.

Ask together: How do the milk and honey move differently?

Draining & swirlingPages 19–20

Foam curves inward toward the drain. Gravity drives water through the drain. Existing turning motion can become a curved inward flow, traced by foam. Here water travels to the outlet, unlike waves crossing the pond. Not every drain swirls.

Ask together: Can you follow the foam toward the drain?

Scientific observationPages 21–22

Vince sketches what he noticed. Vince records something he noticed. Drawings, marks or words let him return to an observation. He does not need all the answers.

Ask together: Which earlier picture matches one of his drawings?

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