Population Education Library
Library My Bookshelf Account

Shown here on every load for easier review — in the real product this would only show once per account (first visit), gated by an account flag rather than browser storage. The header's "How It Works" link reopens it anytime.

"Learn more" on any locked tile opens this same popup with that resource's excerpt (title, longer description, objectives) — wired on every locked tile below, and the same pattern applies to locked tiles anywhere else in the product.

Quick Select
My Bookshelf
Browse all
Collections Most popular TESOL Spanish Language Earth Day
My Units Habitat & Species (6–8) Exponential Growth (6–8) Population Biology (3–5)

Quick Select is now a closed-by-default accordion above the filter cascade, de-emphasizing it relative to Grade/Subject/Topic/Resource type below — that's the primary way most teachers will narrow the library. Collections and My Units are both plain text links now (images removed) for the same reason; each still opens the shared scoped-results shell (see 01b Collection).

Narrow the library

Filter the resources below

Grade
K–2 3–5 6–8 9–12

Color will be used to better indicate if a user has full, partial, or no access to purchased products within a grade band. Peer filter with Subject — always visible, no dependency on the other.

Subject
ELA Science Math Social Studies AP Human Geography AP Environmental Science AP U.S. History AP World History

AP courses now list by default (no longer gated behind selecting 9–12) and hide as soon as any grade other than 9–12 is selected. See the Filter Cascade panels further down for that case, plus how AP interacts with the Grade row depending on what else is selected alongside it.

Topics
Population Biology Exponential Growth Land Use Personal Consumption Forests Biodiversity / Habitat Species Decline Urbanization All topics…

Dependent, one-directional: narrows off whatever Grade/Subject are set, never blocks, never renders empty. Short-list sort falls back through three modes depending on what's differentiable — unlocked-first when access to the set is partial, Grade/Subject-relevance when either of those is picked, alphabetical when neither applies.

Resource type
Lesson Plans Readings Demo Videos Outside Resource Lists Civic Engagement
Sort A–Z ▾
A–Z
Resource type
Most viewed
Featured

Default changed to A–Z (was Resource type). Unlocked-first still applies within A–Z, so owned/unlocked resources surface before locked ones alphabetically. Resource type / Most viewed / Featured remain as alternates. Featured is PopEd’s curated order — the same set used on the login highlight and the Unlock “Full library” preview. Distinct from Collections: “Most popular” there is a curated overlay; “Most viewed” here is usage rank. The grid below is now one flat A–Z list instead of grouped by Resource type (that grouping was tied to Resource type being the old default) — every card already carries its own type badge, so mixing types together reads fine; picking "Resource type" from Sort brings the grouped layout back. Dropped the "All resources" label above the grid itself — redundant with this note and the Sort control right above it.

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Lesson Plan

Adding Armadillos

3–5 Math Science

Students use armadillo population data to practice addition while exploring range expansion…

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Lesson Plan

All in the Family

6–8 Science Social Studies

A family-tree activity linking generational growth to population trends over time…

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Resources

Children’s Books: Population & Habitat

K–2 3–5 ELA

Curated picture books and middle-grade titles for units on habitat, crowding, and sharing resources…

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Video

Modeling Exponential Growth

6–8 Science

A classroom demo of the bean-model activity, showing setup, one full round, and the debrief prompt…

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Lesson Plan

Power of the Pyramids

K–2 6–8 9–12 Social Studies Math Science ELA

Students build and compare age-structure pyramids for countries at different growth stages — shown here with a heavy taxonomy load (3 grade bands, 4 subjects) to see how the tile holds up…

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Reading

The Weight of Water

9–12 Social Studies

A reading on freshwater access and how population growth strains local water systems…

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Civic

Write Your Representative

9–12 Social Studies

A structured letter-writing activity connecting a local environmental issue to a classroom unit…

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Lesson Plan

Almighty Aquifers

6–8 Science

A game linking population growth and aquifer depletion…

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Video

Aquifer in a Cup

3–5 Science

Short demo of a groundwater model teachers can run with household materials…

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Lesson Plan

Bye, Bye, Birdie

6–8 Science

Students weigh criteria for endangered species decisions…

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Lesson Plan

Carbon Crunch

9–12 Science

Explore energy issues through a historical timeline…

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Reading

Crowded Coastlines

3–5 Social Studies

A short read on coastal population pressure…

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Filter cascade — step by step

Above is Step 1 (first load): no selections made yet, purchased grade bands highlighted via ownership color, every Subject/Topic/Resource type showing unfiltered. The panel below shows the same filter stack after Grade is narrowed. Pulled the former Step 3 (Grade + Subject together) for now — Subject reads as an OR filter here (picking Science doesn't exclude other subjects), so narrowing Topics by Subject on top of Grade may not be correct; confirming with PopEd before wireframing that interaction.

Step 2 — Grade "9–12" selected (chosen deliberately: this is also the band where AP courses exist)
Grade
K–2 3–5 6–8 9–12
Subject
ELA Science Math Social Studies AP Human Geography AP Environmental Science AP U.S. History AP World History

AP Biology removed, AP World History added. AP courses sit in the same row as Subject (one row, not a nested sub-group). They already show by default (Step 1 above) and stay visible here at 9–12 — selecting a different single grade band hides them instead, shown next. Visually distinct (blue chip) so they still read as "AP," not a generic fifth subject.

Topics
Personal Consumption Land Use Urbanization All topics…

Narrowed to Topics that exist in 9–12 only.

Step 3 — Grade "6–8" selected instead (AP hides)
Grade
K–2 3–5 6–8 9–12
Subject
ELA Science Math Social Studies

AP courses only exist at 9–12, so selecting any other single grade band drops them from the Subject row entirely — not disabled, just not shown.

Step 4 — AP subject selected alone (e.g. "AP Environmental Science"), no other Subject active
Grade
K–2 3–5 6–8 9–12
Subject
ELA Science Math Social Studies AP Environmental Science AP Human Geography AP U.S. History AP World History

AP only exists at 9–12, so selecting one alone with nothing else active means every match is 9–12 by definition — the other grade chips grey out and become unclickable, and 9–12 shows as the active filter. Removing the AP subject re-enables them.

Step 5 — AP subject selected together with a non-AP Subject (e.g. "Science")
Grade
K–2 3–5 6–8 9–12
Subject
ELA Science Math Social Studies AP Environmental Science AP Human Geography AP U.S. History AP World History

Science exists across every grade band, so pairing it with an AP subject leaves Grade untouched — nothing to grey out or force. Results just narrow to whatever actually matches both (9–12 AP Environmental Science content, plus Science content at any band).