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THE PHYSICAL EDITION

Snails and Shelter

A moving shell catches Vince’s eye. Follow one garden snail as it glides, explores a leaf, tucks away and comes out again. Vince discovers how much there is to notice when he gives a small animal space.

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Explore the science

An animal and its shellPages 1–2

Vince looks beneath a moving shell and notices the snail’s head and body. The shell stays attached while the snail travels. It is part of the animal, not an empty object being pushed along.

Ask together: What can you see underneath the shell?

A foot and a trailPages 3–4

The snail glides over the stone and leaves a narrow shining trail. A broad muscular foot moves the snail. Mucus helps it move and can leave a visible trace; the shine varies with the surface and light.

Ask together: Where does the trail begin and end?

Tentacles and eyesPages 5–6

Vince watches the snail’s long tentacles, with tiny eyes at their tips. This snail has two long upper tentacles and two short lower ones. They carry sensory structures; the eyes sit on the upper tips.

Ask together: Which tentacles are long, and which are short?

Sensing and feedingPages 7–8

The snail reaches a leaf and grazes its edge. A garden snail’s mouth faces downward. Inside, a tiny toothed ribbon scrapes food; those teeth are too small to see in this picture. Snail diets differ.

Ask together: What changes at the edge of the leaf?

Withdrawing into the shellPages 9–10

The snail pulls its head and exposed body into its shell. The shell can protect soft parts. We do not know what triggered this withdrawal, and the shell remains attached.

Ask together: Which parts can you still see?

Watching without controllingPages 11–12

Vince waits back from the shell. Later, the snail extends again. Waiting gives the animal space, but does not make it come out. Another snail might stay tucked away much longer.

Ask together: What could Vince do if the snail stayed inside?

Environmental shelterPages 13–14

The snail is beneath the edge of low leaves, and Vince leaves it there. Many land snails are sensitive to drying. Damp, shaded places can offer cover; a single scene does not reveal everything a snail needs.

Ask together: What is different about this spot and the open stone?

Sources and evidence
  1. A brown garden snail carries its attached shell while moving on a broad muscular foot, without legs.

    Missouri Department of Conservation — Land Snails and Slugs

    UC IPM — Snails and Slugs

    This story depicts a brown garden snail. Other gastropods have different body forms.

  2. Mucus associated with crawling can leave a shiny trail behind a land snail.

    UC IPM — Snails and Slugs

    A trail’s visibility depends on the surface, moisture and lighting.

  3. The depicted garden snail has two long upper tentacles with eye tips and two shorter lower tentacles; these sensory structures help it explore.

    Missouri Department of Conservation — Land Snails and Slugs

    Carnegie Museum of Natural History — Land Snails Ecology: Diet & Behavior

    Tentacles also sense chemicals; the story does not suggest human-like sight.

  4. A brown garden snail can scrape leaf material with the radula in its downward-facing mouth.

    UC IPM — Snails and Slugs

    Carnegie Museum of Natural History — Land Snails Ecology: Diet & Behavior

    Missouri Department of Conservation — Land Snails and Slugs

    Snail diets vary. A single leaf encounter is not a promise that every snail will eat an offered leaf.

  5. A shelled land snail can withdraw exposed soft parts into its shell and later extend them again.

    Carnegie Museum of Natural History — Land Snails Ecology: Predators & Defenses

    Missouri Department of Conservation — Land Snails and Slugs

    The trigger and delay are unknown. Waiting does not cause or guarantee emergence.

  6. Many land snails are sensitive to drying and are often active in damp conditions or found in cool shaded cover.

    Carnegie Museum of Natural History — Land Snails Ecology: Diet & Behavior

    Missouri Department of Conservation — Land Snails and Slugs

    Snails differ in habitat. The leafy border is cover, not a complete captive-care prescription.

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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