1) in what century was the first mechanical clock invented ? a) 1200s b) 1300s c) 1400s d) 1500s 2) how many zeros are there in a googol? a) 20 b) 50 c) 100 d) 1000 3) What does TNT stand for a) Tetra-nitrate-triphosphate b) Tetra-nitride-tetrachloride c) Tetra-nitro-toluene d) Tri-nitro-toluene 4) Entomology is the study of what a) Blood b) insects c) soil d) bones

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