Ntu 1: Hom Tshuaj Kho Kho iav thiab Lawv Kev Siv Chav Dej iav yog qhov tseem ceeb rau ntau yam kev sim. Kev nkag siab txog hom thiab kev siv tshwj xeeb ntawm cov iav sib txawv tuaj yeem pab cov neeg ua haujlwm hauv chav kuaj sim ua kom tau zoo dua. Nov yog qee hom kev kuaj iav iav thiab lawv cov ncauj lus kom ntxaws siv. 1. Beakers Beakers yog ib qho ntawm feem ntau