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January 19, 2018 Laila Khan Added Mathematics to the list.
January 19, 2018 Laila Khan Added Mathematical discovery to the list.
January 19, 2018 Laila Khan Added The book of think (or how to solve a problem twice your size) to the list.
January 19, 2018 Laila Khan Added Take shapes, lines, and letters to the list.
January 19, 2018 Laila Khan Added Fun with lines and curves to the list.