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Cómo usar un ábacoSe inventa el ábaco en Babilonia o China(todavía no se está completamente seguro), primera "máquina" para realizar cálculos, eran hechos de barro, madera o metales, e hilos o tubos
Plan projects on a visual timeline
Map milestones, phases, deadlines, and key events in one place so the sequence is easier to see and share. Timetoast is a timeline maker for work, school, research, and stories.