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- S4.E1 ∙ Leo & Layla Meet Martin Luther King, Jr.
- S4.E2 ∙ Leo & Layla Meet Leo Baekeland
- S4.E3 ∙ Leo & Layla Meet Abraham Lincoln
- S4.E4 ∙ Leo & Layla Meet Booker T. Washington
- S4.E5 ∙ Leo & Layla Meet Susan B. Anthony
- S4.E6 ∙ Leo & Layla Meet Justice John Marshall
- S4.E7 ∙ Leo & Layla Meet Leonardo da Vinci
- S4.E8 ∙ Leo & Layla Meet Elizabeth Blackwell
- S4.E9 ∙ Leo & Layla Meet Jacob
- S4.E10 ∙ Leo & Layla Meet Francis Scott Key
- S4.E11 ∙ Leo & Layla Meet John Adams & Thomas Jefferson
- S4.E12 ∙ Leo & Layla Meet Thomas Edison
- S4.E13 ∙ Leo & Layla Meet Joseph
- S4.E14 ∙ Leo & Layla Meet Lewis & Clark
- S4.E15 ∙ Leo & Layla Meet Pope John Paul II
